not sure what dongle you are talking about but since you don't know where to connect it I take it's not made for ipads in which case it would never ever ever work
ios devices don't support computer dongles as they require drivers and power the dongle using usb which is also something tablets in general don't support
Oops. Perhaps it's not called a dongle. It has been used with my IPad before. It is a small white connector that tethers the IPad to the airplay device. When we used it in the media center, the picture was mirrored on a screen. Now we are trying to mirror the picture on the flat screen in the main office.