Keyboard Shortcut for Automator Service

Hello Again:

Since there is no native OS X keyboard shortcuts for activating screensaver (with password to lock screen), I created an automator service. The service works as it should, but when I go to add keyboard shortcuts there's no + sign and can't seem to find how to actually add the keyboard shortcut.

Can anyone tell me how this is done?

Thanks kindly,

Alex

have a loot at the steps in this tutorial. It is applied to a previously created service but I think you'll get the idea.