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Let's begin by installing a new template. Navigate to Extensions > Install/Uninstall.
Browse to the template installer package on your computer.
Select the installer package and click Open.
Click the Upload File & Install button.
The template has been installed. Now we need to go to Extensions > Template Manager to enable the template.
Click the radio button next to the new template and click the Default button.
Now when we look on the frontend we can see the new template.