Looks to me like he's asking how to correctly use the Rock Jr.can use info on how to correctly use a rifle rest, its a rock jr.
Reading comprehension is not your strong suit, huh? I gave 8 points, A-H, in my first post on how to use a front rest, and how to shoot from a bench in general. I gave ONE point in my first message that states my opinion/experience on the quality of his choice, then gave item #2 as advice for how to improve his existing equipment, and items A-H as advice on how to use it. So you either didn't read my post before criticizing it, or if you did read it, you didn't understand it.And Varminterror, even after two lengthy posts, you still didn't cover anything asked in the OP, however, to me anyways, the first reply covered the actual question.
2) If you're stubborn and insist on employing the Rock Jr. then at least get a better bag on it. I like Edgewood and Protektor bags. Get the appropriate bag for your forend type - but recognize that the bag needs to be treated, and round sporter forends often do not benefit from a front rest very much (without a bag rider installed).
So then a few easy tips for using a machine rest:
A) Elevation: Fix the height to get yourself comfortable over the rifle, then lock the height. Make your fine elevation adjustments from there on out using your rear bag. If you're using a bunny ear rear bag, shim beneath it to get the elevation close. If you're using a squeeze tube, make sure you don't have contact with your hand on the stock to pulse the rifle.
B) Windage: Set your windage aim by re-positioning the rest. For comfort and physical reach, the rear bag won't be able to move much without taking you out of proper shooting position, so anchor your rear bag position on the bench and don't move it. Move the rest to bring you in line with the target. Be sure also that you don't induce torque on the rifle by misaligning the rest from the recoil line of the rifle - the head and bag should be perpendicular to the rifle, otherwise it'll want to jump one direction or the other upon recoil. The easy way to confirm this is by ensuring the rear support leg is in line with your rifle.
C) Place the rifle on the front rest near the tip of the forend, but not so far that it'll slip off when it recoils - and be wary of your swivel stud. Most often, this would put the front swivel stud in the middle of your bag - remove the stud, or better yet, use the old stud hole to install a bag rider. EDIT: Check out gunna1day's picture - that's a badly positioned front rest. That swivel stud is going to hit the rest when it recoils, giving an errant jump to the muzzle and likely damaging the bag.
D) Don't cheek the rifle too much. Laying on the rifle is an expression.
E) Let the rifle track on the bags freely. Unless you're shooting a 3,000ft.lbs.+ cartridge, you'll likely shoot your best Free-Recoil. Shooting with a pad isn't just for girls - pain free practice is productive practice.
F) Open the bolt and let it breathe. Don't string your shots together and let your barrel heat up. The only reason to do so is when you're colony varminting or shooting quickly through a stable wind condition during a competition. Nobody has time to come clear back down to a cold bore, but try not to string shots together - not more than one shot every 2 min. Relax on the line, open your bolt, let the heat escape both ends of the bore, re-read your range card, write another line of a letter to a friend - whatever you want to do to keep yourself from getting impatient and shooting again too soon.
G) Sit more upright than you'd naturally expect. Guys complain about recoil over the bench because they set themselves up to take the full hit of the recoil - which isn't necessary. The lower your bench or higher your seat, the more you'll be "laying" at the bench instead of sitting. The more upright your torso, the more you'll be able to move with recoil instead of taking the full hit as if you were laying prone.
H) Put the rifle more in front of you than you'd naturally expect. Guys often tend to have a bad habit of turning nearly sideways to the target when they shoot over a bench, which twists your body, takes the trigger away from your hand, brings the scope closer to your face, and puts you in an overall un-natural position. Your shoulders should be closer to parallel to the firing line than perpendicular. Remembering to position the rifle in front of you on the bench instead of beside you will help mitigate that habit in your initial set up. (If your target were alive, it should be able to read your t-shirt when you get over the rifle).
There's a lot more to it than that, but those will get you started.