Remove the three screws along the back of the top panel.
Slide the top panel toward the back of the dryer cabinet to unhook it. Lift the top panel up to remove it.
Remove the two screws connecting the control panel to the cabinet. Unplug the electrical connector leading to the back of the control panel.
Lift the control panel up and toward the front of the dryer to remove it.
Open the DLG3788W door. Remove the two screws inside the door frame.
Remove the screws along the top of the front panel. Unplug the door switch connector from its socket.
Lift the front panel off of the LG dryer cabinet.
Slide the belt off the pulleys beneath the drum. Remove the belt from around the drum.
Position the new belt around the drum and pulleys. Reverse the disassembly procedure to put the LG dryer back together.