A) To close the roll-up cover, roll it around the front rails and fold the vinyl flaps beneath. Secure it in place by inserting the bolts. Next, roll the cover over the bed to secure it with the latch. To open the cover, unhinge the locks and roll the cover outward to reveal the bed. To operate trifolds, open the rear end of the tri fold truck bed covers and unlatch them. Simply turn or fold the cover to reveal the cargo.