How to expose web application URL with https

Hi Friends

Here I have created business service for soup service and created unauthenticated url using web application and shared with  client.

As a result I have exposed below URL

http://xx,xx,xxx,xxx:57772/csp/healthshare/production/services/abc.xyz.S...

working fine end to end.

Now I need to change the url from http to https.

Could you please guide me , how to generate certificate and change ssl configurations for web application and expose https url instead of http url?

Thanks a lot,

Prashanth