Hide “Revert to Editor” Button

Hi there, Site Origin tech support team,

My client would like to remove the “Revert to Editor” button on her blog posts.

I have browsed your help community and I see the following response on this topic:

SiteOrigin Page Builder remove “Revert to Editor” button

I see that your tech support has provided custom code to remove the button. What I don’t understand is where to insert this code into the website.

Does this go into the Custom Css Block?

Thank you in advance for your help!