Add or Edit https binding?

I have an IIS 10 running several web applications under "Default Web Site".

I want to enable SSL binding for one of the web applications under "Default Web Site", say "dev-org-iis.domain.com/MyWebApp/Home.aspx"

I have a Org/Domain certificate installed in the server.

There already is an entry for https under Bindings for the "Default Web Site". And the bindings look like the screenshot

Screenshot

Should I "Edit" the https entry and choose the ssl certificate that i have created from the domain/organization

Or should i add another http binding using the "Add" button and choose my certificate in order to apply ssl for the specific web application?