/setowner >Pass here<
when your op
then you say
/owner >pass you said here<
Just dont use > < like i did.
Plus, a message saying "LizGamer was opped" too. So that's an easier way to know you've been opped.
If everyone leaves the room then the room looses all its settings. What LoLGETPWND said was completely correct. If you want to test it on your own follow these steps.
Make a new room.
Use the command /setowner asd (asd is the password here)
Then use the command /deop LizGamer (This removes your @ powers)
Now if you type /owner asd you should see the @ appear again.
If that doesn't work just check that you haven't made any typos etc...