I WANT TO KNOW WHAT TO DO ABOUT A SPAMMY HATER WHITE SUPREMACIST TROLL!!!

HOW CAN I REPORT THIS SCARY DUDE??? https://community.autismsupportnetwork.com/members/supremewhitealliance   I CANNOT GET RID OF HIM!!!  I KEEP GETTING NOTIFICATIONS FROM HIM!!!  JUST LOOK AT THE CRAP HE POSTS!  JUST LOOK AT IT! https://community.autismsupportnetwork.com/adulthood-and-autism/f/26/t/6598   PLEASE HELP!!!!