How to add a signature to my emails

Split from this thread.

I have a Gmail email account, I use Windows Live Mail to access this account.  I need to add a signature to my emails.  I have been reading "HOW TO DO IT" for about 2 hours now and the "tabs" I am told to look for aren't there..........really not there.  The "signature" tab does not exist until you are actively in a new email, then you have a pull-down but it does not offer a way to update or add anything.  I have printed the "how do I create a signature in Windows Live Mail" and it did not work the "File" menu and "Options" are also NOT there. 
Getting tired and need to find an answer.  I am on my computer all day for business BUT I am not a techie but any stretch.  This needs to be easy and it seems to not be.  I have done it before on Outlook Express it was easy.  HELP IS REALLY NEEDED.