You have stated multiple times that you can't see the module in admin. This is the definition of a failed install.

Can you do the two things you've asked about with Better Together? Yes, but you have to write some code (which I gave you an outline for). But this level of modification is beyond the abilities of many people - perhaps including you. This is why I suggested that you stop banging your head against the wall and just hire someone.

You have been working on this for *days* and still haven't completed it. Perhaps this isn't the best use of your time?