To use the Gateway V2 (VPN), you will need to install the CloudFlare WARP client. Instructions on how to do so can be found here: CloudFlare Documentation.
System-Specific Instructions
Below are CloudFlare WARP client installation instructions for different operating systems. The links will take you directly to the CloudFlare website.
Installing the Dockerized Cloudflare WARP Client
The Dockerized Cloudflare WARP Client automates the installation of the Cloudflare WARP client and the Root CA in a Docker container to connect to the HackerOne Gateway. It also allows simultaneous connections to several programs by initiating proxies for each program on different ports.
To install the Dockerized WARP Client, clone HackerOne’s h1-vpn and follow the installation and configuration instructions in the README file.