How to add SSL to wordpress website?

• Purchasing and installing SSL certificate.  

Ordering SSL in your website Cpanel

• This allows you to use https:// URL, but if you wish your custom website to use https:// URL so you can see that secure mark then you need to do a little more.
• For Wordpress websites, you should now configure your WordPress to operate with https:// To complete this you need to update the two site URLs in Settings > General menu of your WordPress admin panel to be with https://.
• Finally you may need a plugin for the website to operate with SSL like "Really Simple SSL"