Within the side navigation bar under News & Calendar, select Pages. This will take you here:

To add a page, click the green button to the right of the screen titled Add Page. Alternatively, you can select +Page within the horizontal navigation bar.
This will bring you to a pop-up window titled Add Page that looks like this:

Fill out the following information:
- Page Title
- Page Verbiage
- Start Date
- End Date
When you have finalized the details of your new page, select the green button at the bottom of the screen titled +Add.