Each app or module in Umbrel node has its own port / onion address.
See more details in Getting started guide with Umbrel - a guide that EVERY new Umbrel user should read (and many more in the Guides section of this forum).
Your Umbrel node onion address is ONLY to access the dashboard and that address should NEVER be posted in any public space. Actually none of your Umbrel apps onion addresses should be posted. Those are private.
In that “connect wallet” instruction it says clearly “this is your electrum server address” to use / copy and paste it into your Electrum app (it’s even the copy icon).