You don't have to change anything. This page shows whatever the mesh already reports about your nodes. MeshCore works with no setting to change at all — your adverts are collected through the observer network automatically.
Meshtastic is the one with a switch. By default, gateways keep your traffic on the local radio network and don't pass it to the internet, so your own node may not appear on this map. That's a fine, private way to run — nothing is wrong with your radio.
If you turn on "OK to MQTT" (Settings → LoRa, on the node), this page can then show, for that node:
Privacy: MQTT shares your packets (and position, if you send one) on the public internet. If you enable it, set your position to reduced precision or leave it off, and remember the default channel is public. It's your call — the page is just as happy without it.
Your mesh radio is doing all this on well under a watt in a license-free band. A ham license takes the same curiosity a lot further.