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Sounds a-lot like this topic: https://buddypress.org/community/groups/miscellaneous/forum/topic/how-can-i-put-a-next-button-in-the-edit-profile-section/ 
Look at the $bp global, at the `$bp->loggedin_user object`, which contains the ID, URL and name of the currently logged in user. `$bp->loggedin_user->domain` is what you are looking for.