My Boss just gave me a website of his friend so the developer that build it was fired and i need to access the data base to change things.
The Website is developed using Bootstrap and I never used it Before where do I find the definition of the database connection help please.
Nowhere.
Bootstrap is a collection of CSS and (client-side) JavaScript.
It isn't a traditional, server-side MVC framework (or anything else that would fulfil a similar role) and doesn't do anything that would involve a database.
Bootstrap might be used in the output of a View from such a framework, but that's handled at a different level in the codebase.