In order to ensure that your website is secure, you must install an SSL certificate. The easiest way to setup an SSL certificate on your website is to simply contact your webhost provider. When you submit a request to purchase an SSL certificate, your webhost provider will install the SSL certificate for you. Once the SSL certificate is installed, your website will load via https and will therefore be secure.
Instructions to purchase SSL certificate with popular Web Hosts
Simply contact your web host and request to purchase an SSL certificate for your account.
For example, here are some links to some popular web host providers explaining how to purchase SSL certificates.