You need Node.js 18 or newer.
Open Terminal (press ⌘ Space, type Terminal).
Open Command Prompt (press Start, type cmd).
Check with node -v.
Your link: (random, changes each run)
Nothing gets installed. Paste this and press Enter:
Your Mac will ask for your login password. Nothing shows while you type it; that's normal.
Your tunnel appears at the top of this page in a couple of seconds. To stop it, press Ctrl C in the terminal or click Close tunnel above.
Tunnels are matched to your public IP. Anyone on the same network (same Wi-Fi, office or mobile carrier NAT) shares that IP and sees the same tunnels here.