I receive NEM Token in BTT forum - how and when can I use it
So I find answer https://bitcointalk.org/index.php?topic=654845.msg9082423#msg9082423
and here https://medium.com/@xtester/nem-redemption-process-f90db6b10eef
After registering token you can go here https://chain.nem.ninja/stakes/registered and check if your BTT account is in the list of registered tokens.