In order for you to have your website build under HTTPS, you will need to have SSL License install on your website. If you do not have one, you will need to check with your Hosting company.
In order for you to change your website url from http://dmc.com to https://dmc.com, you will need to login to your cPanel.
Under the "Databases" section, go to "phpMyAdmin" setting.
On the left, it will show the database name, click on the specific database, then click on the "wp_options" / "wpwe_options" settings.
You will need to update the site URL under two section:
1) "siteurl"
Double click the info under "option_value" column, and change the URL from HTTP to HTTPS.
2) "home"
Double click the info under "option_value" column, and change the URL from HTTP to HTTPS.
Double check your website URL now, it should be updated to example: https://www.dmc.com