Internet Explorer's pop-up blocker is on by default. If you would like to change IE's pop-up blocker settings follow the steps below:

1.) Click on the gear icon in the upper right-hand corner of the screen and then click on "Internet Options".

2.) In the box that appears click on the "Privacy" tab.

3.) If you would like to allow all pop-ups from all websites (NOT recommended) you can change that option here by unchecking the "Turn on pop-up blocker" option. If you instead would like to allow a single website to display pop-ups, click on the "Settings" button.

4.) In this menu you can allow certain websites to display pop-ups. Simply copy and paste the URL of the website into the box labeled "Address of website to allow" and then click the "Add" button.
     You can also change Internet Explorer's default pop-up blocker security by changing the "Blocking level" option at the bottom of the menu.