Like online4 says you can use the arrows to move the capsule around. The side to side arrow will shrink it to half size and you can put it next to another capsule.
You can also go to the information on the right side and at the bottom it gives you the option to "organize your content." It will allow you to more easily move your content around.
Just play around with it and you'll figure it out. I also recommend looking at successful hubs to see how they have their pictures and capsules arranged.