When I was hired for this project, I moved WordPress to https. The client purchased and installed a SSL certificate and then need help getting WordPress moved over to https. I took care of getting WordPress admin secured and then all pages on the front end of the website where also changed over to a secure connection.
All pages were reviewed to address any broken pad lock issues and third party resources that were included. Migrating from http to https on WordPress can be a headache on a live site. If you are doing it for SEO reasons (i.e. Google says you should), hire a professional to get it done correctly or it may do you more harm than good.