Repeat the previous step with the other thermistor wire to remove the black clip from the thermistor wires. as shown in Pic 1.

Pic 2 shows the tab on the metal connector that has been depressed in order to remove it from the plug.

With your fingernail, GENTLY lift this tab up to bend it slightly up so it can be re-used as shown in Pic 3. Compare Pictures 2 and 3 and you will see the tab lifted.