How to invite players to a chat group?

Any member in a chat group can invites players to join the group in the following ways:

Tap the menu button on the top right corner of the chat page, then tap ‘Members’ to view member list. When the group is not full, there will be an ‘Add’ button. Tap it and enter nickname to invite the player.
On chat page, tap on the chat info of any player, and tap ‘Group Invite’ and choose a chat group to invite that player.