Is there anything to get from the POST requests module?

I am doing the module on Web requests and in the section on POST requests and we are asked to “try to get the admin user from what we learnt from this section” but after doing it I see no flag. Is there anything to get? Would be nice to finish the tutorial.

I tried to do it first login as guest with curl to get the cookie and save it and then going as guest to /admin/dashboard.php with that cookie but I don’t see anything interesting to submit.