3rd & 4th Guests free promotion -- changing the guests??

[Incognito1]

There's a great deal for a 14-day cruise that comes out to ~$400 apiece when using the promotion (!).  I'm wondering if anyone has changed their passenger info for the 3rd & 4th guests after booking.  The 2 of us are definites, but 3 and 4 are iffy right now.  If we book with John Doe and later want to change to Jane Smith, is that doable?  I couldn't find the info on Princess' site.

[SKCruiser007]

4 minutes ago, Incognito1 said:

There's a great deal for a 14-day cruise that comes out to ~$400 apiece when using the promotion (!).  I'm wondering if anyone has changed their passenger info for the 3rd & 4th guests after booking.  The 2 of us are definites, but 3 and 4 are iffy right now.  If we book with John Doe and later want to change to Jane Smith, is that doable?  I couldn't find the info on Princess' site.

It should be no problem, as long as it's done before final payment. 

Edited June 18 by SKCruiser007