Host URL = web address of the site we are editing

The link button works fine when linking to a URL that is not the web site of the Host URL. When we create a link to a page that is a page within the Host URL the link is changed from http://hosturl.com/pagename.htm TO /pagename.htm

 

We need the ability to chage the URL to be https://hosturl.com/pagename.htm

 

How do we do this?