After you have registered the Desktop software you need to uninstall the unregistered version of Pocket Cook from your PDA and reinstall it from your newly registered desktop software.
After you uninstall the old PDA version, open your registered desktop version.
In the PDA menu of the desktop version chose download PDA software. Download your full version from there.
The registration takes place in the PC desktop software. After you download you can select to install it from the same menu. Be patient when downloading the software. It seams frozen but it is working. That is all takes.
These instructions come from Pocket Cook Support
Good luck