There is a plus on next to the button which converts it to a timeline, if you already haven't got it on a time line change it. Press the plus button until it wont go anymore and start shortening the pictures. There will be a little bit yellow telling you how long each one is. Try to get it down to 0.24. And if you want it a bit longer ( for pauses) go up to 0.42.
if you want to put it online go to the side bar and press to save to computer. Then go to youtube sign on and press upload video.
Hope that helps. 