The Websites App displays the websites you’ve purchased.  If you are on the BASIC or STANDARD plan, you will have one website here. If you are on the PLUS  or PREMIUM plan you will see additional websites, each labelled "Click Here To Configure This Website." 

Clicking on the thumbnail image of your website takes you to that site in edit mode: Here you can edit your website using the four buttons at the top right of the screen.

Here are the design and edit function choices of each button:

Once you have made changes to your website, you can publish those changes. Learn more about how to publish your website here.