How initialize the database connexion with the Joomla plugin

I have installed the joomla (Ver 3.1.5) plugin for DHTMLX spreadsheet but I don’t know how to reach the page to set the database connexion.
It seems to me that’s a trifle, but, as the installation process for the plugin is different with the one of the full package, I can’t see what I forget.
Sorry for my bad english.
And thanks for the answers.

Joomla plugin connects to database without any specific configurations. It just takes existing Joomla connection and use it.