Download Jumi package into your local computer.
Installation of Jumi is the standard Joomla! extension installation.
During one Jumi pack installation all Jumi extensins (component, module, plugin) are installed.
Should you do not know "how to" follow these several simple steps:
Login as administrator into your Joomla! backend. And then.
You have just installed Jumi component, plugin and module.
To use Jumi plugin you will have to enable it at "Extensions -> Plugin manager". The same applies for Jumi module ("Extensions -> Module manager").