You can request to join any public Party or private Party that you have the link to.
First request to join with a nice message.
Then if the Party's Host accepts your request to join, you'll be able to chat with the host directly in the Party.
Usually after being accepted into the Party and a brief chat, you're ready to start playing! You usually need a controller for Parties, so please have one ready.
If you decide to withdraw from a Party, you can always do so clicking this button.