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PHRE$H
You don't contact us...we contact you. And by us I mean look for a private group. Atlas or Blueprint. You definately don't do it through forum posts.
I don't know. Is the Atlas group still the preferred method?
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If I'm not mistaken it's not possible anymore to submit new maps for matchmaking. Maybe someone can answer this question in the Optimatch Forum.
Go to Google and search "Halo Community Cartographers". OR you can search it up on Waypoint Forge Forums.