To get borderless printing, you need to do the following:
When you chose your paper, to the left of the print button is the resize button.
When you click this you will see this screen. Around the outside of the paper are blue lines.
As you run your cursor over the line a hand will appear. Do this slowly, as you need to click on the line and drag the blue line right out to the edge so you cannot see a white edge around the paper. You need to do this on each edge.
Now click Print.
Your printer page will appear. Look for a Preference button.
Click this and you are looking for a borderless option. It may be on the features page.
Click the box.
If this option is not available you have still reduced the white edges.
Click OK or Accept to set this option. Now Click Print.