Duel Commands

To report players ingame click on the diplomacy tab then the "i" icon next to the player(s) name then click on the icon that states report player.

Please see screen captures below for a visual of the above information:

https://gyazo.com/ee947d47db186662b1162253af3152f1

https://gyazo.com/c7f14db5a23fb6bd6bac3fabd15a62f0