If you have an existing P&O Cruises Account, use that to login to the P&O App.
If you don’t have a P&O Cruises Account, you’ll need to create one. You can do this either on the P&O Cruises Website or the P&O Cruises App. When you open the P&O App, you’ll see a screen that asks you to Login or Explore P&O Cruises. Click on Login, then click on Register. It will ask you to enter your email address and password, select your Title, enter your legal first and last name and your date of birth.