I can't even figure out how to add Mass Effect 3...
1. Go back to the old BSN site
2. Click your avatar over on the left-hand side of the page
3. Click the "Games" tab
4. Under the section marked "Mass Effect 3 - Player Profiles" you should see two links
5. Click the link marked "Mass Effect 3 - PC [Your Username]"
6. Copy the URL from that link, then come back to the new BioWare Forum
7. Select your username at the top of the page on the right-hand side, go to "My Profile"
8. At the top of that page, click the "Edit My Profile" button
9. At the bottom of that page, find the "Game Profiles" section
10. Paste the link you copied earlier into the box marked "Mass Effect 3" and then click "Save Changes".
Done! You can do the same with Dragon Age: Origins and Dragon Age 2, as well.