Hi there.
Probably due to
I’m a beginner š I’m not able add CSS on a page/post using Simple CSS plugin.
I can’t find the āSimple CSSā metabox.
Where it is?
when you edit a post or page, the meta box should display either below the Post content or in the Sidebar. If the Sidebar is not visible then click on the Cog icon located in the Top menu bar.