Should be easy

[Mary D]

I have my name, address, etc in my default email message form, but I have no
idea how to edit and save the changes. When go to Tools - Design a Form -
Message, Open - Edit Compose Page, that section is like a picture and does
not allow me to make any changes in the text.
There has to be an easy way, but I cannot find anything in the help files.
Is there a file I don't know about which contains this info that I can edit?

 

[Brian Tillman]

I have my name, address, etc in my default email message form, but I
have no idea how to edit and save the changes.

Why wouldn't you simply use a signature?