Im not sure i understand, but do you mean signatures? Like the one below my name?
If thats the case you will need to go on
Click on Signatures and put in your signature there using the
Also go on Preference and make sure that you have 'Always attach my signatures' enables (on Yes)
Or was this not your question?
--Sidenote-- Admins, i think this one would fit better in off topic.. Why not have a support section? Maybe i'll need to put this one in the suggestions box :O