How to connect mongoDB to MEAN app deployed in AWS

Question

I'm deploying an app for the first time and I have deployed my MEAN App on AWS using Elastic Beanstalk but I haven't used the terminal to do so.

Now, I want to connect MongoDB with my deployed app.

Probably we need to connect to dynamoDB for Mongo database in AWS. Right?

And I would also like to know if I can use mlab database here instead?