Disconnect the black and white wires attached to the WLAN card by pulling up on the connectors with your fingers.

During reassembly, the black and white wires reconnect to the WLAN card near the black and white triangles, respectively.

Remove the remaining wires from their protective sleeve by hand.

The wires in the sleeve are only used in other Dell laptop models. During reassembly they do not connect to anything so just place them back into the sleeve.