We recommend you run v2Ray manually the first time, so you can easily monitor for errors:
~/Downloads
❯ /usr/bin/v2ray/v2ray -test -config /etc/v2ray/config.json
You'll need to configure your web browser to use the SOCKS proxy at 127.0.0.1 port 1080. (This is easiest with Firefox.)
Then use the browser to open 12vpx.com/ip to see if you're using the VPN succesfully.
Hit CTRL+C to stop v2Ray when done.