Aw, you are too cute for words. No laughing, honest.Do you have a picture you'd like to use? If not, do an internet search for 'animated sig pics' and you'll find several sites where you can browse for different styles. Once you find one you like, do a right click on it, then 'save as' (name it whatever you want) into your documents on your 'puter.
Next time you want to post, start the post, click 'upload' and find (browse) the pic in your documents. Click UPLOAD and then copy the new URL that is given to you.
Go to User. Change. In the sig pic box, paste the new pic you chose there and hit SUBMIT.
Hope this is helpful and not too confusing!