Your comments

Did you sign up with Google and/or Facebook only?

The same way. Swipe left to delete.

Planned to improve and fix in 5.1.

If fake Vine is still used and is helpful I will fix the UI (currently broken locally) - which is the reason why I have disabled it at the moment.

Enable Fallback composer from Global Preferences.

Currently not possible, but I plan to add in multiple usernames per user soon.