Here are a few steps to describe how to install the plugin and get it working.
e.g.
1. Download and unzip the plugin
2. Upload the entire “unlimited-theme-addons” directory to the /wp-content/plugins/ directory
3. Activate the plugin through the ‘Plugins’ menu in WordPress
4. Go to “Theme Addons” menu and configure your settings
5. On the other way you can Activate the plugin through the ‘Plugins Menu’ screen in WordPress