Er, in that pic the metal bumper bar has been pulled off of the plastic cover. That's not good.
The removal procedure is in the Cardisc. You need to unbolt the bumper from the two bumper shocks (there's like three nuts on one side and two on the other). Then on each side at the bottom front of the bumper there's a rubber attachment you need to unbolt. THEN you can slide the bumper back off the screws/slots mentioned in the other thread.