Sucuri have partnered with LetsEncrypt to provide HTTPS support to all of their clients. Users on the Professional or higher plans can use custom (EV, Wildcard, etc) certificates in addition to the LetsEncrypt one.
If you plan to use the LetsEncrypt certificate, all you have to do is follow the steps to activate the domain to point to the Sucuri Firewall and the SSL certificate will be created automatically.
If you want to use your own certificate and you are on the Professional or Business plan, the process is very easy:
1. Go to CloudProxy Dashboard
2. Click on Settings
3. Scroll down and you will see:
4. Click on upload certificates and you will see:
5. Just enter your SSL private key and your SSL certificate and click on Proceed
The certificate is not instantly enabled, as it can take up 5 minutes to get fully activated. After the certificate is enabled you will see this on your dashboard: