Hi there, I was unaware of LetsEncrypt till a week ago. How the world just keeps getting better.
I am taking over a site's management, which will mean I need to re-issue the certificate paired to a new Linux server (one of mine). I need to know how and where to log into the service (don't see a login at Let's Encrypt) Thanks!
Let's Encrypt doesn't have a web-based login interface; all interaction with it is through a program (that usually runs on your web servers) called an ACME Client.
And this ACME client running on your server connects to a Let's Encrypt API also using the ACME protocol. This API requires certain cryptographic signing measures which are automatically done by said ACME clients and isn't usable by us humans.