Click Telegram Channel in @InviteMemberBot, and it will provide you with the instructions:
To add @InviteMemberBot to channel admins, open channel profile and click Admins:
Then click Add Admin:
Enter @InviteMemberBot in the search box:
And set bot permissions:
@InviteMemberBot only requires one permission — Invite Users (or Add Users).
Now it's time to forward a message (any) from the channel to @InviteMemberBot. To do that, click a button with an arrow (or right-click a message and click Forward) and select @InviteMemberBot as the recipient):
Done! The channel was added successfully:
In some Telegram clients (iOS, for example) there is a known bug — you can't enable Add Users permission for the bot.
The workaround is to enable this permission in another Telegram app. We recommend Telegram Desktop.