Ingress controller configuration

Hi all,
Issue: we are unable to get the DNS mapped to the application configured in kubernetees-azure.
Verified that all pods are running by running the command kubectl get pods -n mynamespace

There is an nginx server which manages all the services/applications running internally in kubernetees cluster. Now the issue is, how do we connect nginx to ingress so that we get to access the application from browser.

Cluster Information
Kubernetees version - 1.16
Cloud being used - azure
installation method:
Host OS: Ubuntu 18.04