topic written in wrong category ..

It doesn't matter if you have posted in the wrong interest. You can make the tags pertinent to the topic and that will get it seen. If you want to delete it then you can use the (!) at the bottom of the topic and request admin to remove it. If anyone participates before it is removed they will lose their earnings though. Do not re-post it until after it has been removed or you risk loding the second one as it would be a duplicate topic.