I think I got lucky and figured it out. Are you on Windows? If so, click on the font name you want and save it. Then after it downloads you need to find where you saved it and drag it to your font folder in the control panel. It should automatically install.
Here are the directions from the site, it says something about unzipping, but I didn't do that because I don't know how, but it still worked
Unzip the file (download WinZip), and save the fonts to a temporary location¯preferably to your Desktop¯for later deletion. Go to "Settings" on the "Start" button, and select "Control Panel." Double-click the "Fonts" folder. Select the "File" menu, and click on "Install New Font." Select the font(s) from where you saved them and click "OK." The fonts are now installed. Delete the font files from where you temporarily saved them.