Someone correct me if I'm wrong but I believe that if you're a team that scans/translates mangas/manhwas, you can reach out to Mangago to put it here.
I don't know if translators are part of Mangago's staff or work on their own, if they're paid or if they offer their services for free but this is what I always believed.
Throughout any manga/manhwa you read here you can see dedicated pages to the translators and they're different every time so I think that my first statement seems more correct..
I hope that someone who knows better about this gives you a clearer insight. ( ´ ▽ ` )"
Just open the report red flag on the left side, check other and paste the staff the link to your chapters. They usually upload within few hours.
It's all done for free to my knowledge. Some scanlation groups prefer mangago over the other manga sites because there's a huge BL community here, so that's why you still see the exclusive releases (that is, until someone won't spread them elsewhere).
How to upload chapters to existing manga/manhwas?