there are two ways to change your avatar again, as long as you still have a local copy of your tribal avatar:
1) change your avatar at your primary account, like google, for all platforms you use.
2) change your avatar just for the notepad++ community:
click on your avatar at the top right of your screen.
then click at your name (Alan Kilborn), as seen at the screenshot below.
(… yes, i know it does not say Alan Kilborn there … 😉)
Imgur
click on edit, as seen at the next screenshot:
Imgur
click on change picture as seen at the next screenshot.
important note: do not press delete account under any circumstances. 😄
Imgur
click on 'upload new pictureand select your desired avatar picture. once you're satisfied, hitsave changes`.
btw: i think you can also upload animated gifs as avatars here, like this “admin email” dude a while ago, just in case you want to play around a bit.