Once your rehearsal is confirmed, you will receive your codes on email and they will be displayed within the booking in your Pirate account.  They look like this:

You can also share the codes by clicking the 'Share these codes with your band' link above, which will send the codes via text as you get nearer to the booking itself.

Please note: Codes are specific to the year, month, day and time of your practice.  You must enter the * before the six digit number.