Whenever I try to update my profile and click save, it says that the email address is already registered and in use. Due to that it is impossible to update a profile. Does anyone know how to fix this?

edit: i found the problem; i have two accounts with the same email address - that's what you get when switching from another cms

I noticed there are 2 diff places to manage the users from. One is under Site>User Management (do not use) The other is under Components>Community Builder>User Management(best).
The latter has a couple of extra features (like confirmation!) so use it only.

I also noticed the username gets changed to the email address automatically when you make a new account and you have to edit it from the admin panel to get it to be the actual user name you originally entered.

Hope that helps some!