Uploading

You can click on the small flag mark on the left of the screen, i think you can only see it on your computer tho, you have to be on the manga site on the manga that you want to upload on, you'll see an option to upload chapter

Ohh you can also see it on mobile too

Detailed guide:
http://www.mangago.me/home/photo/5318652/

Then all i have to do is screenshot?

Yup

So i wnt get banned? Or shld i make a new account

You can also upload anonymously on here, just log out of your account and follow the steps written in the guide.

You don't get banned for uploading

Thanks