How to PERMANENTLY change your grades [Works even if you refresh!!!]

Steps:
-Install Greasemonkey for Firefox, or Tampermonkey for Chrome.
-Open up your diary & right click on the grade you want to change
-Click on 'Inspect', then right click the selected element
-Hover on 'copy' and click on 'copy selector'.
-Create a new script
-Type in the following:
var grade = $("YOUR COPIED SELECTOR GOES HERE");
$(grade).text("YOUR DESIRED GRADE GOES HERE");
-Click on save & refresh.
Sorry if the audio is not synced up properly. I am editing on Windows Movie Maker, since my laptop can't handle much more.
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