Navigate over to the tab labeled 'Services' and click on it!
Then you will see all your active services. Go ahead the service you are wanting to enabled SSL Certificates for.
Once you have select the service you are going to want to click 'Login to cPanel' this button can be found on the right under 'actions'
Once you have been redirected to your cPanel go ahead and type 'SSL' in the Search tab and then click 'Lets Encrypt™'
Once you see this page click on 'issue' below actions. When you click issue it can take upto 2-4 hours before you can use https:// on your domain.