RAMPS GADGETS3D LCD Reference manual

Just did first power on of my Prusa i3 printer
Nothing burning

Is there a user manual for how to use the LED thingie knob
Just tried and errored it a bit
I managed to get moving from Auto home function
Got to X and Y end stop fine, small steps each time I push button, but after that it started going upwards in Z
I have my end stop for Z at bottom .... is that wrong or is Z motors not good connected ... ?

But trying Axis motion in the LED menu, nothing happen at all

Haven't loaded any FW or Arduino stuff yet

Thanks
Ha det gött
Bosse

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Prusa i3 Reworked, Delivered March 28 2014, RAMPS 1.4
Göteborg, Sweden