Zoom Phone is incorporated directly in to your existing TCNJ Zoom account, you would access it by logging in the same you do to access your TCNJ licensed account.
When you open the Zoom application, select "Sign in" and the choose the "SSO" option that is presented under the regular login boxes.
When prompted for a domain, enter in "tcnj" so it completes "tcnj.zoom.us" and then click Continue
This will bring up your default browser to log you in with the TCNJ SSO