Growbot works best in channels & groups. Inviting it is easy (just like any other user). To invite Growbot to public channels, simply send a slash command like /invite @growbot #cool-channel. To invite Growbot to private channels, select “invite others to this private channel” and search for @growbot.
Once invited, Growbot will send you a direct message asking for permission to introduce itself. You can choose to have Growbot introduce itself to the new channel or introduce it yourself.