PPPoE in Fedora 22 Gnome 3.16

1) type in the terminal:

$ nmcli connection add type pppoe con-name office ifname eno1 username abdulmomen@office password 'HighwW , sighW'

you should see:

Connection 'office' (9913272c-141e-488f-91b6-263b77018250) successfully added.

2) continue in being in the Terminal and type:

$ nmcli connection up office

and a message like this should appear to you:

Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/3)

And, now you should have a PPPoE connection in your Fedora 22 Gnome desktop edition.

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Thanks to Mustafa Muhammad for his help :)