Download EDNA
Access your downloads list in Chrome or Firefox (Options, Command, L keys)
Click on the Edna.Mac.pkg. If you have downloaded it before you may see a number (1) within the link
You'll see this window pop up, click Continue
Click Install
Hit Ok to allow the install
Enter your Mac password
Hit Ok to allow the installer access to control System Events
Click Close to finish the install
You can Keep or Move to Trash, EDNA is now installed