Okay, when you are using the Ouija Board, yes, you make the Demon/ess swear he/she is of Father Satan. Because these are crucial times and the Demons understand this very well. If you notice they hesitate or try to answer something subtly to avoid a simple question...they are NOT of Satan.
I stopped using the board as I always get disturbed by a lot of entities. But I don't stress this. I can hear my guardians telepathically or they comes in psychically or intuitively if they have something important to say or show/guide me. I know what to do now, so I won't waste their time.
Only contact them if you have something serious to ask or talk about. And be sincere and polite.
Hail Father Satan!