GIMP is free and open source so it will be better if you visit the GIMP website and find support, most of the users uses adobe photoshop even users uses cracked version from torrents
But there are lots of us here who know GIMP - however you won't get anywhere with a simple call out. Describe your problem and you can speed up the process. Oh, and Neil is right, if the software/script/system is big enough (and Gimp is) you'll get help faster at their own forums.