While attempting to use a Ouija board, communicate like you would with someone in the room with you. Have patience and don’t expect answers immediately. Sometimes it takes a while for a response. Change your questions and even your words used to ask them. Typically, a yes or no answer is easier to obtain than something else more specific. Have pen and paper nearby to record anything else that might have been communicated.
When attempting to make contact, be prepared for deception. An evil entity will likely disguise itself when asked whether or not it is good.