You need to log in on your Artist Website and change it there. With the old Artist Websites, those two things were synced. If you made changes on FAA/Pixels, they were replicated through to your Artist Website. But now you (thankfully in my opinion) have the opportunity to have a different avatar for the community here versus for your own website there.
The bio and about tabs on your Artist website are also edited there separately now. Once you log into your Artist Website, you'll see a whole host of things you can change there.
Mark
tisdaleart.com