How to install a Joomla 2.5 template?
First, you should download the preferred Joomla 2.5 template on your local computer. You can search for one in the Joomla 2.5 free download templates list here.
Then log in your Joomla 2.5 admin area and navigate to Extensions -> Extension Manager. Click on the Browse button, find the template archive file and click on Upload & Install.
After this navigate to Extensions -> Template Manager and make the new template default for your web site.
Joomla is a powerful software that is easy to work with once you have the right host to support you. Before you lose any more time with the wrong host, check out the SiteGround Joomla hosting offer.