Is there a way to change my about.me address?
Eg.: I registered as
about.me/123abc but now I'd like to have
This is now possible.
To change it, go to Account Settings → My Information → Change My Username (small link under the Save button) → follow the instructions in the modal overlay.
Please note that it will take a some time for the change to be approved, period while you will not be able to login (at least in my experience).