templates and it can be found in the root template directory of any template inside the Joomla! templates directory.

Where do I find Joomla templates?

Log in to Joomla, and choose Extensions→Install/Uninstall. You use this command to install or uninstall any extension, including plug-ins, modules, components, and templates. Extension Manager opens. In the Upload Package file section, click the Browse button to find and select the new template file on your hard drive.