How do I connect a 1 pin array to a module in pcb using KiCad
You just need to create a one-pin schematic component and associate it with a one-pin PCB footprint (just a single pad).  Place the schematic symbol on the schematic, and connect it as required.  When you load the netlist in PCBNew, the associated footprint will be placed on the PCB, with an airline showing the required connection.

You just treat this "one pin array" as a normal component.