There are 2 empty spaces in the 10 pin plug next to each other between the blue wire and the black wire. This is where the thermistor wires will be plugged into.

The tab you previously lifted on the thermistor wires will face the side of the plug with the windows in order for it to slide fully in and lock into place as shown in Pic 2. You will hear an audible click when fully inserted.

Insert both thermistor wires side by side into the two empty locations and fully lock the plugs in place as shown in Pic 2.