UPDATE (X1.3) - Strikethrough, subscript, superscript added to editor toolbar. Blank posts will not be added. And users can COMPLETE THEIR PROFILE!
Click on Users on the top bar, and then at the bottom of the list of users will be:
Current user does not have a profile
Click here to complete your profile
Click on the second line (on the Users page) and it will take you to the page to complete registration.
Note that old posts will show up as unknown user, but newer posts will be correct.
UPDATE (X1.2) - there is a Refresh Page button just above the editor on new pages, AND you can use the forums on the right to reach threads you can now edit.