Okay, I think I understand what your problem is, but I could be wrong. Here's my answer to the question I think you're asking.

You purchased the V3 morphs. You want to apply them. No problem. Go to the Poses folder, and navigate into the directory where they are. (I can't recall the exact structure ATM, and I'm at work.)

For each of the morphs you want to enable, load the INJ. (Make sure V3 is the selected figure before each INJection.)

That should pop up a bunch of new dials for the body parts that were INJected. (There is an INJ for all body parts at once if you're just going to do them all anyway.)

Once loaded, you can spin the dials till carpal tunnel sets in, and your skin turns a pale shade of yellow.

Now you might be thinking these packs automatically INJect certain "looks," but they don't. They only make the dials accessable. There are many free characters around, especially here on 'Rosity, that will autospin those dials for you. However, simply loading the Daz morph INJectors does not give you a new look from the default V3 you get when you load her.

As for the REM poses, you only use those to REMove morphs. For example, if you load all the morphs, and only spin, say, the arms and breasts, you can REMove the INJections for the legs, abs, whatever. (Keep in mind, I don't recall how the morphs are grouped, so I'm just giving examples.)

Hope this helps!