Up to a certain point you can move that knurled aduster nut upwards also with your fingers.
When that does not work anymore and you would like to go further up it works well by putting a 1.5mm hex driver through that hole in the chassis to lock the adjuster nut and create the rotation from the "other side" by moving the steering (at the wheels) by hand.
There is a quite good video explaing this (it's in german, but you should get the idea even without the comments) ... the relevant part starts at 4:40 and there is a nice close-up showing it detailed starting at 6:06.