Log in to your admin panel and go to Appearance->Themes. Then click on the “Add New” button.
In the search box located in the upper right of the screen, type the name of the theme you want to install.
In this example we have searched for the theme, “Twenty Fifteen.” The theme will display in the search results. Hover over it and click on the “Install” button.
The theme will automatically install and you will see a sequence of messages notifying you that the theme has downloaded, unpacked and successfully installed.