Most likely you'll have regulars that may ask you to put them on the roster for say next week. As said in the earlier videos a team can't enter itself on the roster until the start date/time is surpassed. However you as the host/admin can.
Try it out for free for a week. After that, a one time use for an event would be $15 or you can subscribe for $5/month and use it for an unlimited number of times. You can contact us at Webmesa.com