You have to sign up on the SignUpGenius as well as on APO online. Do not sign up on APO online unless you successfully sign up on the SignUpGenius, as slots may get filled by other people. Make sure you sign up for the correct task. I only put course marking because the actual race conflicts with Fall Summit and the Fall Foliage Run. https://www.signupgenius.com/go/10C0C4AA5AE2BA5FEC07-57907281-mttom#/