PureVPN + Dedicated IP on MT300N-V2?

Hi dears, I just paid PureVPN + an addon Dedicated IP since my idea is to have a static dedicated public IP in my router. However I can’t configure it. Even after installing PPTP via Luci, I can’t find options like “Host name” So that I can configure PureVPN properly.

Isn’t it possible to configure this in the MT300N-V2?

Thanks in advance

Sorry but can you try Openvpn? Purevpn provide Openvpn definitely.