The same way all the poor users out there not using CommandBox have to do it 
Actually, it’s still easier even without the tray icon. You can see if this command still works for you on Linux
server open /lucee/admin/server.cfm
Or just type that into the browser. you can view the server home dir like so
server into property=serverhomeDirectory
Of course, it’s much much easier to simply use CFConfig to manage your Lucee default password than to screw with that terrible password.txt file. Just do
install commandbox-dotenv
install commandbox-cfconfig
and then place a .box.env
file in your user home with a default password like so
propertyFile set ~/.box.env cfconfig_adminPassword password
Now, restart the CLI. You’ll have an env var called cfconfig_adminPassword
always defined which CFConfig will pick up any time you start a server and it will set the default password for that server automatically.