Hey, Jemma.
Only the names of the account owner and staff members will appear in the author section I’m afraid. This means it wouldn’t be possible to add another author without first creating an account on their behalf. I tested my account to see if adding then deleting a staff member would allow the name to still appear, however, the system reverted the name to the next available author.
That all said, I know that this is a wanted featured that many other merchants have requested. With that, I’ve added your vote on to this existing request to show our developers that there is further interest in getting this added in the future.
If there’s anything else I can help with please don’t hesitate to reply back and I’ll happily help out!