If you modified the kv6 files, for example the smg, semi, shotgun, use slab6.
Open the new kv6 in slab6 and then take a picture of it.
Or take a picture of the modification ingame
If you mean you already have an image but cant figure out how to post it here.
I upload my images to
Imgur. Once you have uploaded them then post them here with the [img] tag.