They sure do make it easy for their target audience ......don't they ?

No wonder !
The esc they use is a cheap copy of another cheap chicom esc. It uses jumpers to set reverse and battery type. The jumpers are located on the rear corner near the wires that connect to the motor. The battery type jumper is the one near the outside edge of the case .
Move that jumper from the rightmost and center pins over to the leftmost and center pins to set the lvc for LiPo. Refer to the attached pdf.

You won't find that anywhere in the manual or on their site.

Good luck with that truck !