I have just done a Co-op any% speedrun with a friend and wanted to submit it. where would i do so. there is no category on mossranking either.

There hasn't been discussion on what would constitute a good rule-set for co-op. If you'd like to propose a adding a co-op any% category there is an #s2-rule-discussion channel at https://discord.gg/spelunky-community which is where we discuss the addition, and rules, of new categories.