1. In the page you want to change, click Edit
  2. Type the link text and select it. 
  3. Select the Confluence link icon, or type Ctrl+k. The Insert link dialog box appears. 
  4. Select Web link and specify the URL for the website. 
  5. Click Insert

If the website is external to the U.S. Government, add an exit disclaimer as described in How to create links to external sites