Helllp, I Can't Synchronize on DM

:confused:I updated my desktop mgr to 4.5 and now it will not llow me to synchronize. Everytime I attempt to sync I received a pop-up that reads "no applications configured for synchronization" however it will not allow me to configure the destop mgr....what shall I do?

Hit Synchronize, then a new screen will pop-up. On the left hand side will be "Configuration", under that will be "Synchronization" and "Add-in". Hit Synchronization and follow the steps to reconfigure your sync.