Editing Your Twitter Profile from Twitterrific (Mac and iOS)
How do I edit my Twitter profile via Twitterrific?
In Twitterrific, open your profile and tap the Edit Profile button at the bottom of the screen. From there you can change your profile's avatar, banner, name, website, location, and bio information.
You cannot edit your user profile from within Twitterrific for macOS currently. You'll need to visit Twitter.com to modify your avatar or your user profile.