Hey bro.. Welcome to ForgeHub and thank you for posting your maps.. But you have a few issues, please refer to our sites posting rules to find out on what you need to fix up!
You are posting in the wrong forum. This needs to be under Halo 3 discussion. Contact a mod or admin to have them help you with your thread. I'll also help you out by contacting them too.
You should check out some of the tutorials for map posting. There are even some templates out there that you just fill out and it does the rest for you. This thread is for posting and describing specific maps with pictures and info. There are other discussion threads this can go in.