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To confirm you have a token click Config next to Authentication in the email's Remote Mailbox tab and make sure you see a Token tab. If so, you have a token. If not, you need to get a token before proceeding further.
Once you have a token make sure Status is set to Enabled and Save Changes in the email's Remote Mailbox tab. If that saves successfully then IMAP/POP was able to authenticate. If not you will see errors that you need to fix.
Once that’s been saved you need to make sure you enable email fetching at the system level (Admin Panel > Emails > Settings > Email Fetching > check the box for Enable > Save Changes).
Once that’s done the last step is to setup a cron job/scheduled task to automatically poll the mailbox without human intervention: