- Option a)
Power off your Umbrel under Settings > Shutdown, and remove the SD card.
Then, put the SD card into your computer, you should see it show up in your file manager with the name boot.
Open a file named config.txt, where you must add these lines at the end:
# Disable WiFi
dtoverlay=disable-wifi
# Disable Bluetooth
dtoverlay=disable-bt
Save changes and put the SD back in the Raspberry Pi.
Finally, turn on the Raspberry Pi.
.
- Option b)
Open config.txt to edit via SSH:
sudo nano /boot/config.txt
Enter this lines:
# Disable WiFi
dtoverlay=disable-wifi
# Disable Bluetooth
dtoverlay=disable-bt
Save the file:
Ctrl+X, Y, return
Restart your Raspberry Pi:
sudo reboot
.
This is with Umbrel installed? 
The same password you use to log in to the Umbrel dashboard. If you haven’t yet run through the setup process, the password will be set to moneyprintergobrrr.
Yes, if you trust your local network.