Marguerite Tonjes will open a request to give you CMS AT FERMILAB affiliation once your Fermilab Site access is completed. For this step it is not expected for you to have any additional actions to take.
You know you have your account when you get the email with the subject: "Welcome to the CMS LPC CAF (Central Analysis Facility)". Configuring for connecting to the cmslpc computers will be taught as part of the first two weeks at Fermilab.