Does anyone know how to upload a new manga. I know for existing manga we just press the up...

https://www.mangago.me/read-manga/mangago_how_to_guide/uu/br_chapter-4274/pg-1/

Here's how to do it. I would recommend you the second method because that's the one that worked for me.
Hope this helps.

Also if you end up doing it check on "new manga" to see if it has been uploaded because supposedly they are going to send you a notifications but they didn't do it for me. I only found out cause I was looking at " new manga"