How to install Flytec 2011-5 RC Boat power line？

How to install Flytec 2011-5 RC Boat power line？

① Thread the tail end of Line 1 into the battery compartment outside the top shell, and then plug in the XH plug
② Thread the tail end of Line 2 into the external battery compartment of the top shell, and then plug the tail end into the SM port
③ Connect the SM ports of Line 3 and Line 2; Apply waterproof adhesive internally