Hello.
Today i post a "tutorial" about "how add your signature" on the PokeMMO forums.
So:
1:
Click on your name in the red circle. (top right of the forum):
2:
Click on "My Profile":
3:
Click on "Signature":
4:
Click in the red circle:
5:
Write the image URL:
And click "OK".
6:
Then, you must click "Save Changes", and it's done.
Tell me if you can't.
ENJOY