Your first time using Caffeinated Content you should see a message that says "Yo...your creds ain't checking out. Run over here and get a license while the gettin' is good!"
Now, depending on your age bracket, you might have some concern about the maturity of the person who wrote this script. Don't sweat it - the script works as it should.
Provide your email address you purchased Caffeinated Content with (typically your PayPal email address).
Paste in the Registration key.
Click on the "Add top level link" box.
Type in something (anything, i.e. - YahooDemo) into the Yahoo Developer Application ID box.
Leave the Debug Mode box unchecked.
Leave the Post Delay box unchecked.
Click the "Go" button.