Please follow the following steps to find your activation code for the Chrome Extension.
Go to my.dyslexiefont.com and click on "Chrome extension" in the left menu.
On this page, you have a manual with at the bottom two blue boxes with two codes that you can copy and paste in the Chrome extension. When you have done this the extension will be active right away.
We have a video about it here: https://www.youtube.com/watch?v=Be_cRQYYT3w