UFT Application area - how to associate web add in to application area

I have created a new business component in UFT and linked the correct application area to it. I cant add anything to the object repository as the web add in is not associated to it I am trying to associate the web add-in to an application area and cant seem to do so. I have checked out the application area. The properties pane is blank and settings is greyed out. I cant seem to find any method off associating the application area to the web add in. The web add in is loaded on UFT start up