We just updated to the latest version of XenForo and v2.2 included a lot of updates so a few things might look off at the moment. We're working through them and please let us know if you spot something. Thanks!
Easy , what you need to do is open the kit in GGS .Click on the part of the collar that is to be made transparent (in this case with the kit youve shown above it will be red) Once the red is highlighted in the colour palette slide the colour settings until they are the same as the part of the collar they are adjacent to (in this case white) save and import back into the game !!