http://kzaeunogz6s75ptgy6ifjzwwy75xdfenenswvrczd7mewxgrad5a.b32.i2p/portfwd
In qBittorrent and μTorrent it's under the Connection tab in the Options/Preferences: You should also go to the Advanced section in Options and change the Network interface to the VPN's. While testing on a Windows 10 system running WireGuard, it looked like: With OpenVPN, it looked like: As you can see, the network interface name for WireGuard is obvious (cs-nodename).