Help with BuddyPress Set up and google analytics.

I am trying to get buddypress plugin set up and activated but I keep getting an error message that my google analytics is not active nor set up properly. Because of this, I can not get the buddy press plugin activated. I am really struggling with this aspect of the setup. Can I get some descriptive instructions as to how to accomplish this? It is also my understand that I must also have multisite activated. Is mingle a better easier more straight forward alternative? Which do you feel is better, and easier to implement into a new site? Thanks for any assistance.
Elise~