Here is the most common method currently mentioned ⇒ verified by Collab.Land robot
Usually the project team will set up a dedicated Channel (channel) for users to input instructions, when the correct input "!join", the robot will automatically reply and give you a DM (private message).
However, starting on 2021/12/04, Collab.Land bot has been upgraded and stopped the original DM private message verification process. It set up a new channel #collabland-join.
Please visit this new channel directly #collabland-join Press the "Let's go!" button Then press the "Connect Wallet" button.
Please click on the first option "Metamask"
A small window for signing will pop up, and then click "Sign Message".
If successful, the following prompt message will be displayed, indicating that the NFT in your wallet has been successfully connected and verified.
