cloudflared is the Cloudflare Tunnel client. This contains the command-line client for Cloudflare Tunnel and a tunneling daemon that proxies traffic from the Cloudflare network to your origins. The daemon sits between Cloudflare network and your origin (e.g. a webserver).
You need to have a Cloudflare account with an active Cloudflare Zero Trust (free tier is sufficient).
You should configure your Cloudflare Tunnel with the Cloudflare Zero Trust dashboard.
When you create a tunnel, the dashboard will give you a token. This token needs to be placed in this add-on's config.
token: super_secret_tokencloudflared token. Get this from the Cloudflare Zero Trust dashboard.