The signature instructions are laid out in the link from the PM I sent. Theres also many tips on the forum and a list of medical terms and abbreviations we commonly use around here. Once a PM has been read, the tiny flashing envelope disappears. Click on the tiny down arrow next to the My Stuff tab and on the drop down menu click on Private Messages.
I had written a long reply but hit the wrong button and POOF! the whole post along with several links disappeared. Sorry I havent yet had enough time to find all the links and rewrite another reply.
PS... Thanks Gloria and Paul for your help