[BirdOPrey5]

Originally Posted by contramontanum

That would be the url from the browser address bar.

Where would I find this validation box? I go to to CP > AME CP > Display Definitions, and see no such options.

In case I wanted to try your unofficial definitions, should I just delete all the original definitions and import your your .xml File?

In AME definitions, viewing the definition of the youtube code, the last box on the screen should say "Validation." Are you using AME 2.5 for vBulletin 3.8?

No you wouldn't delete all the definitions, just import mine, there is no existing youtube "short" URL so it won't replace an old one, just add the new one.