Hello,
Are there any instructions on how to set up Apache with a free signed SSL certificate on CentOS?
This article only has the instructions for Ubuntu. https://www.digitalocean.com/community/tutorials/how-to-set-up-apache-with-a-free-signed-ssl-certificate-on-a-vps
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Following the steps in the Ubuntu article, you should be able to obtain the certificate from StartSSL. The differences will come when you install it on the server. This article on creating a self-signed cert for Apache on CentOS should point you in the right direction when combined with the info in the StartSSL one.
The key differences from Ubuntu are installing
mod_ssl
And the location of the Apache configuration: