How To Change user name

when i send e-mail to clients a nickname appears as the sender…how do i change that?

Inbox displays and e-mail from "" instead i would like it to say ""

If you have a ‘catch-all’ account set up and you are using webmail (squirrel mail)…
When you log into your account put the name you want to use in the blank space before

I discovered whatever I used when I logged in was what appears on the mail I send out.
For example,, etc