Open your Printer Assistant. This is an icon of the printer on your desktop. Select Preferences and when that opens, click on the Advanced button towards the bottom right of the window. You should see an option for Borderless Printing. To the right of that, it probably says Print With Border. Click on that and you can select Print Borderless. Click OK | Apply | OK and you should be able to print borderlessly. This will make borderless the default setting.
You can also change the setting in the program you are using when the Print Dialog Box opens after clicking on Print. Click on Preferences and go through the same process as above. This will make borderless the setting for that particular photo only.