The station is moving too quickly to stay in your field of view more than a few moments. Naked eye viewing is best and a pair of binoculars can be used once you've sighted the station. Over time, as construction increases the size of the station, sharp eyed observers might be able to make out the station's general shape. Photography Tips and you should be able to capture the Space Station's orbital track as it passes across your field of view. You're only going to get one chance during each pass to capture the swift moving station on film, so advance perpetuation is everything.
Timing is everything.
Make sure you have an accurate clock synched to NASA time and open the shutter of your camera about a minute before the station is scheduled to appear. Keep the camera's shutter open until the station leaves your camera's field of view. If all works as planned, you should have a bright line on the finished picture tracing the satellite's trajectory across the sky. Don't fret, it make take several attempts before you get the perfect picture.