When using PrestaShop for you e-commerce website, you are able to choose between different looks. To install a new PrestaShop theme, you have to download it locally and to extract the archive at your computer.
You can download one of the free PrestaShop Themes provided by SiteGround:
Then, you should go to your website's admin dashboard and click on Design > Theme and Logo.
You would be redirected to the Theme management page where you should click on the Add new theme button.
This would redirect you to the theme installation page where you may install the theme in a few different ways - by importing a file from your computer, by importing from the web via an URL or over FTP connection. For the purpose of this tutorial we would import the file from a computer. Click on the Add file button and choose the theme file. When ready click on the Save button in the related field.
Now go back to the Design > Theme and Logo page and find the newly installed theme. When you hover it, an Use this theme button would appear and you should just click on it.
That's it! Your new theme is already installed and active!