I hared about your free service, but still now can’t know from where could I get your SSL certificate, and what should I do ?
Let’s Encrypt is currently in closed beta, effectively meaning you need to apply to use software that isn’t quite finished yet. You can apply with your domains here. Once you have been accepted you will receive an email with instructions on how to create and configure your certificates.
There will also be a public beta from December 3rd, which there aren’t instructions for yet.