set bgp communities

Hello Friends, I have some prefixes to export to my BGP peer and I want to set a communities when I am sending them. So, can you instruct me the syntax of how to sent this community (100:12) to my prefixes ? please |Thanks in advance

verify bgp advertise route

Dears, I am new in BIRD route server and I configured a bgp with upstream and I want to verify the prefixes that I am send to my peer. So, anyone can guide me how to do this verification ? -- Regards Twana