To access your Camp or Party, you'll need a Codo Code.
This is a short set of letters that is unique to you, and kind of acts as your "key" to allow you access.
Don't have a Codo Code?
If you booked a Camp, check your email, as you'll have been sent the code.
If you've been invited to a Party, the organizer should have provided you with a Codo Code - check with them!