Numark Omni - Traktor Pro - Scratch mode

Numark Omni - Traktor Pro - Scratch mode

Sorry if this has been posted a billion times before, but what exactly do I need to map to my jog wheels if I want them to scratch when I have a modifier held down?

i was actually messing on my omni control earlier, theres a parameter called scratch on which you can map to either the jog wheels so u can just scratch as normal but means u cant tempo bend or u can map it to a spare button to either toggle or hold

Sorry for being thick , but how do you do that ?

Been racking my brains , i want to be able to scratch with the wheels during playback , not pitch bend.
I am very naive when it comes to the mapping process , so if anyone could give me an idiots guide , to setting the wheels on my Omni Control up to scratch during playback , i would greatly appreciate it . I have Tracktor Pro 2.

Thank you.