Node Js with Sequelize ORM and postgre connection.

I tried to understand this post https://www.digitalocean.com/community/questions/urgent-need-please-help-me-out-with-the-issue-i-am-getting-the-below-error-when-trying-to-connect-my-node-js-with-database , but as the suggestion is for mysql I hit a wall. I have the same error, maybe some Variables are wrong or I just don’t get what needs to be done or where to start. I also made a simple route that says hello world an that is working.