Server Admin Permissions

  • I'm hoping someone can help, i've exhausted all my google capabilities. I am trying to add my friends usernames on my permissions so they can have server access. They all created g-portal accounts, i have added there names and each time it says "this username does not exist" I put in my own username and it lets me do it. Not sure where to go from here on adding them so they can start up the server when i'm not around. Any help appreciated, thank you.