...Copy the code of src.js by pressing CTRL + A, now paste that into your browser console (CTRL + SHIFT + I). Copy the code from bookmarklet.js by pressing CTRL + A, and create a new Bookmark and paste the code you copied in the URL option.
Collection of utilities that interact with the Blooket API / website
...Before running the script on the Blooks page, make sure you click on a non-common blook. Check for any mistakes you may have made. If you are certain it is a problem with the code, go to the Issues tab of the repo and create a new issue.