There are few different options on how to print your ISN calendar although there is currently not a Print button/function on the ISN calendar page.
For Windows users the following options will allow you to print the screen:
*Click on CTRL and P from your keyboard at the same time;
*Click on the PrntScn button located on your keyboard; or
*Right click on your mouse which will provide a Print option:
For Mac users the following article will assist you: http://support.apple.com/kb/PH11229