If you have been invited to a Secret Santa game, you need to be a registered and logged-in user to accept the invitation.
If the invitation was sent to your account, you will see a notification in the Secret Santa section inviting you to view the invitation. If the section was previously disabled in the settings, it will automatically turn on when you receive an invitation.
If you received an invitation via a link, the game information will be displayed on the screen after following the link.
After accepting the invitation, you will need to fill out your profile so that it is easier for your Santa to choose and give you a gift.