1. Copy the Tracking Code from Feedbackly dashboard
2. Open the WordPress Editor within the Appearance menu.
3. Open Header (Header.php)
NOTE! The Header.php file will load. It may not look exactly like the file below, but the basic structure should be similar.
4. Add the Feedbackly Code just before </head>.
The header.php file you see might not contain any <head> HTML tags. If it doesn't, you'll need to find the correct file in your theme that does contain this tag and continue from there. Your theme's designer or a WordPress specialist would be the best place to start in this case.
You are now set and good to go!