WordPress is awesome, but sometimes things are tough to find.
There’s a “Delete” button in the dashboard for removing anything from your site. It’s just tricky to find.
If you visit the Appearance menu, you can click on a theme and in the popup window that appears, you’ll find the Delete button in the bottom right corner. All you need to do is click that button and press OK in the browser prompt to delete the theme from your site.
This is Ben from WPAnswered.com and by the end of this video, you'll know how to delete a theme from your WordPress site. Deleting themes is really easy. The button to do it is just hard to find. To delete a theme, first login to your WordPress dashboard and then click on the Appearance menu. This will take you to this page listing all of your currently installed themes. Next, click on the theme you want to delete from your site and that's going to show this popup. At the very bottom right corner, you'll see this "Delete" text that turns into a button when you hover over it. Click on it and either click on the "OK" prompt from your browser or simply hit the Enter key and the pop up will disappear and the theme is now deleted. Before you go, there's one more thing you need to know.
Deleting themes you aren't using is a good idea because it frees up space on your server and it reduces clutter in your dashboard. However, you should always keep one extra theme installed at all times as a backup. If you make a bad edit to a PHP file in your theme, or if an update gets disrupted midway (which is rare but it can happen), this will break your site so that you can't access it. In this event, WordPress will auto switch to a fallback theme as a form of damage control so you can still login to fix your site. Other than that one emergency backup theme, it's best to delete every other inactive theme on your website.
That's everything you need to know about deleting WordPress themes, and if you learned something new, why not subscribe? I've got a lot more WordPress tutorials on the way, and if you still have any questions, please just post them below in the comments section and I'll see you there.