Quick answer: We do it for you!
All Podpage websites with custom domains come with a free SSL certificate. This means, when someone goes to your site, it will be https:// and will be a secure connection.
As soon as you get your domain DNS configured with Podpage, we start setting up your certificate. It usually take a bit of time, so you might go to your website and see a security error. If you do, just wait an hour or so and check again. That should resolve itself.