Remote Starter Install problem , Fortin Evoall+ Crimestopper rs7-g5

Hello,

Trying to wire up the remote starter and a bypass module , installation guide from Fortin calls for wires that should come out of a remote starter , Ignition 1 (+) and Ignition 1 (-) to be connected to the vehicle's wiring , With IGN1+ going to the fuse box (still looking for that one) and IGN1- going to the start button. What puzzles me is the IGN1 (-) wire , its coming out of the button on carside but I cannot identify its counterpart on the remote starter side.

any help would be appreciated

Attached are the manuals for bypass and remote starter

Thank you,