You can report the issue using the flag on the left side of the screen while reading the manga / being on the manga's page.
The chapters are sent this way: the uploader creates a gallery on imgur or imgbox then sends the link for the gallery to mangago using the same flag I was talking about. Then mangago uploads the chapter a few hours later. I don't know about the process in-between, but I don't think there's a lot of control there since there are fake chapters (sometimes just ads) being uploaded sometimes.

Noticing more on more series on here not being properly uploaded. Whats the options to correct it is there a way contact admins.