How to install a Joomla 2.5 / 3 template
Go to the Joomla! administrator area of your website.
Select the Extensions menu and Extensions Manager menu.
Select the "Browse" button and choose the template zip file you have downloaded from our website to your computer.
Select the "Upload & Install" button to install Linelabox Joomla! template.
Joomla! attempts to install Linelabox template, and if it is successful, you will see a confirmation message.
To activate the new template go to Extensions > Template Manager, choose the installed template and click on "Make Default".
Setup a Joomla Template
Go to Admin Joomla! > Extensions > Template manager > Styles > Linelabox template.
Set "Site title" (logo text) or upload a logo from your computer.
If you want, hide Joomla content from the homepage.
Choose the slider that will be displayed in this template (Flexslider or AnythingSlider).
Upload Slideshow images from your computer.
Add text to the images in your Slideshow.
More info: http://www.linelabox.com/tutorials