Hi..great you're feeling better!
To change or add to your profile....click on "Control Panel"....then "Edit Profile"...scroll to the bottom, and create or change your signature, click "Save".
I would suggest you log out, then exit windows or go to another site, then back here, log in and your profile should be changed and your signature showing. At least that's what I've found what works.
Your signature will only be show/change as of the new postings after it's changed in your profile.
Remember that a profile can only be 10 lines....spaces between lines are counted as one.
quincy