I can perform many administrative actions in your groups, just add me as an administrator and send /administration to adjust the settings for your group.
Here are some administrative commands and a brief comment regarding what they do:
• /pin <text> - Send a Markdown-formatted message which can be edited by using the same command with different text, to save you from having to re-pin a message if you can't edit it (which happens if the message is older than 48 hours)
• /ban - Ban a user by replying to one of their messages, or by specifying them by username/ID
• /kick - Kick (ban and then unban) a user by replying to one of their messages, or by specifying them by username/ID
• /unban - Unban a user by replying to one of their messages, or by specifying them by username/ID
• /setrules <text> - Set the given Markdown-formatted text as the group rules, which will be sent whenever somebody uses /rules