Could anyone step by step explain how to set up port forwarding with router Glinet Flint?

[Newbie_ 0]

Please see the title. I'm not really sure. It's going to be used only for torrenting. 

Edited ... by Newbie_

[drum 6]

Hello Newbie_
Take a look here:

IMPORTANT: do NOT forward on your router the same ports you use on your listening services while connected to the VPN. Doing so exposes your system to correlation attacks and potentially causes unencrypted packets to be sent outside the tunnel from your client. However, if you connect a router directly (for example DD-WRT, Tomato based firmware router) an additional step is required, please see how to forward ports in dd-wrt tomato with iptables:

 

https://airvpn.org/faq/port_forwarding/