Really strange, that forum can't find any tevo users....

sorry if this has been addressed before, but

I'm just starting 3d printing and have just put together the black widow, overall I'm pleased, but I,m complete noob. The Z axis home position switch seems to be backwards, wrong polarity. The bridge won't go down to home unless the switch is activated. There seems to be no place to mount the switch so that it would be active the entire z travel and then de energize at home position. How do I invert this switch? I guess I could learn how...