Hello, friend!
To add multicast user (port) 0/2/1 to multicast VLAN 101, enable user authentication, enable log report, set the maximum bandwidth to 10 Mbit/s, set IGMP version of the multicast user to v3-forced, and bind the user to right profile music, do as follows:
huawei(config)#service-port 100 vlan 101 adsl 0/2/1 vpi 0 vci 35 rx-cttr 2 tx-cttr 2
huawei(config)#btv
huawei(config-btv)#igmp user add service-port 100 auth log enable max-bandwidth 10240 igmp-version v3-forced
huawei(config-btv)#igmp user bind-profile service-port 100 profile-name music
huawei(config-btv)#quit
huawei(config)#multicast-vlan 101
huawei(config-mvlan10)#igmp multicast-vlan member service-port 100
For details about configuring multicast, click: Configuring the Multicast Service
Thanks!