Nextcloud Webdav login, Wrong in the manuals (Nautilus)

I got from my provider a email with my username and password, the username is my email. I cant login into it, i never see something about that in the Manuals.

I use Nautilus on Ubuntu 16.04 and tried this:


how do i login? its seems to fail becouse the "@"
is there a way of using a http understandable way to replace the @?

it works,

why is it wrong in the Manual?