I was informed that their was a forum called the Menewsha Nations and that their was a thread there where you could post about leveling up adoptables from places like dragon cave except I don't know where it is. Does anyone know where exactly?

Yep, just click on General Discussion and it's the topmost Subforum. -nods-

For ease of use: http://www.menewsha.com/forum/commun...newsha-nation/

Here's the Dragon Cave thread for you too:
http://www.menewsha.com/forum/commun...anonymous.html