If spirits ask you to do weird things - stop using the board for that session. Anything negative being written on the board means you must put the board away for that session whether you want to or not. The entity should leave by your next session - which can be that day or some time later. You do not have to work with the same group of friends each time you use the board. Do not ask spirits to bring you things you want but would not otherwise have.
All spirit have their boundaries.
You must find out the limitations of the spirit you are talking to. Never ask spirits to do harm to others. Never use the board to control others. Do not let others use your board when you are not using it. Keep the board in a special place of your choosing.