well... this depends on your phone company. my signature, what do you mean? on verizon, it is the you name or the "nickname' you put on the end of a text or pix message. for example... this is from my point of view on my env2.
From:Mark
Hello
<mark is cool> <---- this is the signature
Jan 9, 6:00pm
to set this up on most verizon phones, go to
messaging
settings
scroll down and it should say signature
there should be 2 choices- none or custom
go to custom
and there should be a place where you can type you name or what have you (like mark on the example)
