To register for an IOF tournament you need to have an AAU Membership. Once you have an AAU Membership you will receive an AAU number (keep that). Now go to the Track Wrestling website. Find the "EVENTS" tab. In the "EVENTS" tab, find the "FUNCTIONS" tab, and search events. If you search "IOF" you should see an active list of all IOF tournaments for the season. Select the tournament you wish to enter and register with your AAU number.