How do I change my Signature Line on my emails?

A company sends me emails that I need to save. I would prefer to change the subject line to make it more useful to me. Other than forwarding every email to myself with my customized subject line and then deleting their original email, is there a way...

this area would be your e-mail you are composing. Then you want to close and you do this (next line) My love for alays, (your name) This is what I want to change.

I put a "signature" in my compose email section which automatically appears on all my out-goin emails. I did this over four years ago and cannot remember how. I need tochange the signature. Any help would be greatly appreciated. Thanks, James...

How do I change the signature on my emails?

I need help. How do I change my signature on the bottom of my out going emails?

I USE TO GO BY THE NAME JESSY...NOW I WANT TO CHANGE MY NAME BACK TO MY BIRTH NAME "NORMA JEAN"..MY SIG. ON MY EMAILS AUTOMATICALLY SAYS "HAVE A NICE DAY JESSY"...I WANT TO CHANGE ALL THE JESSYS TO NORMA JEANS

I have tried to change my signature line's font and color. I have saved it, I have changed it to Rich Text...nothing seems to work.

How do I change my signature line on the bottom of my Yahoo. mail?

How do I change my signature line on my email.