In order to activate a retail version of FotoAlbum Pro, you must enter the Activation ID that was either e-mailed to you, or received in a retail version. This activation ID is in the format: "XXXXX-XXXXX-XXXXX-XXXXX" and is entered on the "Help->FotoAlbum Pro Licensing" menu option.
You can enter the Activation ID at any time during the trial period or after the trial has ended. Once the Activation ID has been entered, all FotoAlbum Pro features will be enabled.