Urgent.: UserPro Registration doesn't work?

[Curtis Marshall]

when my users register the load signal starts and stops but the registration doesn’t go through and the users stays on the same page.

website http://www.freshkingz.com

Existing users can log in but none can register on my site.

[admin]

can you please verify your purchase as mentioned in the Support Forum Instructions please ? Thank you.
How To:
1. open http://userproplugin.com/userpro/profile/edit/
2. copy & paste your purchase code into the “Envato Purchase Code” field
3. click on “Save Changes”