It's very easy to do - using the mouse pointer of your PC, go to the point where you want the intro to begin, hold down the left mouse button and drag it back to the beginning of the intro. This will highlight that portion of the intro you wish to remove which is done by hitting the Delete button of your PC. It's that easy. Be sure to re-save the file so you will not lose the new version of the file.

All the best,

Gary