Type at least the email address of each commenter that you want to auto approve.
For a more reliable filter, add the name and/or the url separated by a comma.
Add only one commenter per line, these are all valid configurations:
user@mysite.com
user@mysite.com, Mark
user@mysite.com, www.mysite.com
user@mysite.com, www.mysite.com, Mark
user@mysite.com, Mark, www.mysite.com

Type the username of each user that you want to auto approve.
Add only one username per line, like this:
username1
username2
username3
username4