I've made a plugin and i do not wish to continue with it because i'm gonna create something new and i also want to get back to running my server ~Thanks DT_Rush
You can't delete a thread and im pretty sure the mods won't do either. Just write in your thread that you won't continue it.
You just report your own thread with a remark that you want it deleted. Mods will delete it when they come around to your report.