Ember Firebase Authentication

I've successfully connected my app to Firebase and am authorizing users while also adding additional user information to a user-profile model. There's a few things I'd like to do with this data.

First of all, upon signup (username, password), I'm asking the user for some additional information (name, avatar, city, etc). How can I use this data alongside the authed user (i.e. Welcome :name site wide)? Additionally, I'd like this user to only see their own profile and be able to edit their own profile. A bit stumped currently and just looking for next steps...

Thanks!