Click on the "Gear" icon, and change the x-axis and y-axis numbers to something appropriate for your data. Look at each column in your table. What "ballpark" should you be in?
This changes what the graph "counts" by. If you want it to count by 2's, type in 2. Sometimes it's not going to fit, so if it doesn't do what you tell it to, that's why.
Always make sure you tell what your categories are. Make sure anyone viewing your graph knows exactly what's going on!!