[@netweb Keymaster 11 years, 2 months ago]

bbPress has quite a few functions that will help you here:

bbp_get_user_profile_url() would get you /forums/membre/user
bbp_get_user_profile_edit_url() would get you /forums/membre/user/edit

You can also use bbp_get_current_user_id() if you need the current user ID