How to change the lobby?

[ShadowCharle]

Hello,I'm want to konw how to change server's lobby.This is a problem when running.

dst_master    | [00:02:00]: Setting lobby region to default: US
dst_master    | [00:02:00]: Registering master server in US lobby
dst_caves     | [00:02:05]: About to start a shard with these settings:
dst_caves     | [00:02:05]:   ShardName: Caves
dst_caves     | [00:02:05]:   ShardID: 586447616
dst_caves     | [00:02:05]:   ShardRole: SECONDARY
dst_caves     | [00:02:05]:   MasterHost: 127.0.0.1
dst_caves     | [00:02:05]:   MasterBind: (null)
dst_caves     | [00:02:05]:   MasterPort: 10889
dst_caves     | [00:02:05]: [Shard] Connecting to master...
dst_master    | [00:02:10]: Registering master server in US lobby
dst_caves     | [00:02:15]: [Shard] Connection to master failed. Waiting to reconnect...