Every issue you write will have a byline under the subject line. This is to help your readers get to know you, and it's especially helpful if your name doesn't appear elsewhere in your newsletter title or subject line.
In the screenshot below, you’ll see the ‘byline’ in orange:
To change the byline of your newsletter, first head to Account Settings, then the ‘Profile’ tab. Scroll down to ‘Newsletter Author’, and edit the text in the box to the right:
Hit save, and you're all done!