This tutorial show you how to change your WP themes easily.
The first thing you have to do: you should have a themes that ready to upload on your blog, you can download it from the other website, Or you can find themes on the Web using a Google search for “free wordpress themes” or just “wordpress themes”. If you find a theme you like on the Web, you can download it to your computer and then upload it using the Theme Installer.
Go to your dashboard >appearance>Themes>install Themes>Upload and Choose the theme that you download before and press Upload. (this steps works on WordPress self-hosted)
look this image for more details.
Ok, after finishing upload the themes just click ‘Activate’ and see your blog.
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