You can only enter a Douyin group by invitation, and you cannot actively join other people's group chats. In the Douyin message interface, click on the upper right corner to create a group chat, select mutual friends, or click to invite Douyin users to join the group, copy the group password and invite others to join the group through comments or private messages.

To join someone else's Douyin group, you need to be invited by someone in the group. You can invite others to invite you. In this case, you just need to click on the link.