Wiring assembly for Kriss Vector V2... How to?

Hi. Having installed my new motor, I have taken out a blue wire from motherboard and DO NOT know wear it fits. Please help

Refer to image

IMG_20190722_163158

The outside pin on the side with the 3 clumped together?
Looks like it’s on the under side (lower pin?) from this angle too…

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position indicated by xtopic but same row as others.