I finally got something written but now i can't get diddles on the notes to achieve the diddle sound.  I checked all the articulations and found some that look like a diddle but would not make the sound when i put it on.  I went to sibelius help department and didn't find anything and i couldn't find anything on these forums that told about how to enter in the articulation, just how to fix the sound problem with it.

Diddles are located on the keypad under the third tab.

It's hard to find help on ";diddles"; in Sibelius and other software because the actual correct musical term is tremolo.