If your printouts are automatically printing on both sides of the paper and you just want it on one side, that is a setting within your web browser that needs to be adjusted.
After you have selected what you want to print and have clicked the Print button, you will get a print preview. On the left side of the preview, you should see some settings (destination, pages, copies, layout, etc.). Go to the bottom of that column and click More Settings. Remove the check in print on both sides- that will turn off double-sided printing and your printouts will only cover one side of the paper.