WHAT DOES HOW TO DOWNLOAD CERTIFICATE FROM OPENCLASSROOM MEAN?

I have a DAG natural environment with 6 servers(2Mailbox+2CAS+2EDGE,Exchange2013 CU21), on that scenario, I just do the process in Anyone mailbox server (for instance MX1SVR) and then wait the new certificate to replicated to another 5 servers all through some hrs ? OR i have to operate the same process on 1 CAS server and one EDGE server?Selecting