MongoDB and Mongoose - Install and Set Up Mongoose

//“mongoose” should be connected to a database

please how to connect mongo on database? i already have a username and password but i don’t know where i will use it see they give this // ```
mongoose.connect(, { useNewUrlParser: true, useUnifiedTopology: true });

  this the link //
https://replit.com/@bowak/boilerplate-mongomongoose#myApp.js