Note: Before this article can be completed a new store text record need be created and assigned to the store. If this is not done you will not have permission to complete the steps in the article. Look at this article for more information.
Navigate to Content > Power Features > Store Text & Languages
Scroll down to the section of the page where you see the Localization Keys:
SEARCH THESE STRINGS TO EASILY LOCATE
These keys contain the text that is displayed to the shopper. You will click the edit button in order to begin editing.
Once select change the value that is listed in the HTML editor box and click save.