If the preference does not already exist in the list of preferences (1) then you will need to add it.

1) Click on the Add Preference button.

2) Enter the name of the preference.

3) Click OK.

Note: You only need to add preferences that you want to a) enter a default value for and/or b) broadcast a message for when the value is changed.

First you enter the object to send the message to.

1) Click on Add Message.

2) Enter an object reference.

3) Click OK.

Next you enter the message to send to the object.

1) Enter the message name.

2) Press OK.

You now need to handle the message that is broadcast to the object (or elsewhere in the message path). Add a message with the same name you entered previously and define a single parameter which will be the name of the preference.