Hello,

is there somebody who can kindly help me on how to turn on/engage the NOSE WHEEL STEERING SYSTEM?

I checked the whole cockpit switches without success, manuals didn't point me.

Thank you so much.

You can via the MVAMS create a shortcut to initiate or switch off NWS for the F4

IIRC you need to assign a key in the MVAMS app - keyboard assignments, e.g. Shift G.