Installing Joomla Extensions

1.Login to your Joomla administrative area then go to Extension-> Extension Manager
2.Now you can install the extensions by
Option1: Uploading the package File, by clicking on browse and selecting the file. Then select Upload and install.
Option 2: Installing from Directory. This is used for big extensions. The extension has to be uploaded to the server using FTP and then go to Extensions Manager and select the path to the folder containing the extension. Then press Install
Option 3: Installing directly from a URL. You just need to enter the direct zip archive address and then press Install.