The extruder settings, as far as I know, do not work on those lcd’s ( they don’t seem to obey the firmware) I never changed them because I have never used them. I will try and remember to look into this in the morning.
You don’t need to set up anything. The best way to test it is plug it in with the usb and connect it to repetier host, then use the manual controls in that program.
So you might not have a hardware problem at all, could just be trying to extrude from the lcd?