Astrill Setup Manual:Setup WireGuard on pfSense
STEP 1: Login into your pfSense
Turn on your pfSense router and login as root user by selecting "shell".
STEP 2: Install WireGuard
Run following command to install WireGuard: pkg install wireguard
If it fails to install then install Bash first and then try again to install WireGuard.
To install bash run following command: pkg install bash
Once WireGuard is installed, login into pfSense through your browser.
And check under "VPN" tab, you'll see "WireGuard" option. If yes, follow rest of the steps, otherwise repeat above steps carefully.