Connecting LIS3MDL polulu externall compass

hi all, want to connect an external compass to my pixhawk 1, i purchased the LIS3MDL 3-Axis Magnetometer. i read in the change logs that since arducopter 3.5.4 this magnetometer is supported but my pixhawk dosent see it at all.
im running arducopter 3.5.7
does any one have any advice?

TIA
josh.

Is it necessary to ask three times the same question? Sorry four times, I missed one.

@mlebret sorry, didn’t meen to troll, I’m new in this forum and didn’t know where to post. I am in desperate need of getting this to work.