In order to change your Joomla template, first you have to log in its administration panel. Once there, you should go to Site --> Template Manager --> Site Templates and mark the new template as default.

Please click here to access our Joomla tutorials and find more detailed information on how to manage your Joomla at your web hosting account.

If you have problems installing Joomla templates yourself, ask your host for assistance. SiteGround provides the best Joomla hosting and such requests are handled with ease.