First before anything, create a database, as SocialEngine requires a database in order to work.
Sign into cPanel, and then go to “Databases” in cPanel and create your database there. We have a Step by Step
Article on how you can add databases which can be found here: http://blog.arvixe.com/how-to-create-a-database-and-user-for-mysql/
To install Social Engine, please read these steps. Learn More