at the top right of the Main WC page there is a settings link just above your nick name. Click it, it will take you to your settings page. In the My Account tab at the left, there is a "Crossreferance with your stardock acount" link. Click on it and enter the Email address you used to purchase your Items with, then hit enter.
This will bring your SD and WC accounts together and set you to a customer level, and grant you full acess to the WC libraries. It may take a bit for the servers to fully merge every thing so give it a few..
As for registering the WB, uninstal the trial and go to the same area as above "settings"/registrations tab. this will offer links to the full version of WB or what ever you bought. install it and all should be good.
Remember to uninstall the trial versions first..