Hide my WP Theme Name

I don’t necessarily want to hide the fact that I’m using WP.. I just want to hide my theme name. I’ve installed Hide my WP plug in and activated it but my theme name still shows in “What WP theme is that”.. Does anyone have any experience using that plug in? If so, is there a setting that hides the theme name only? If not, is there another way to hide the theme name? I am new to WP and don’t know much CSS. If there is a simple way to do this please let me know. Thanks!