[quote name='mbradley1992']I have looked EVERYWHERE but I can not figure out how.[/QUOTE]
You can only close your own threads. I'm not sure if you have to be a member for a certain amount of time in order to do it though.
In the OP, do this:
Edit-> Go advanced -> Close thread after submitting message.
[quote name='mbradley1992']I don't see anything that says Close thread after submitting message.[/QUOTE]
Then you may need to wait a certain amount of time to get that ability, either veteran or CAGiversary status.
If you wish a thread to be deleted, report the thread by reporting the Original Post and state why you request the deletion. The mods will see the request and decide if the thread should then be closed, deleted, modified in anyway, or left as is.