The one circled red in the second picture looks like a 0.5mm interal 4-pin FPC connector. It might be used as the interface for the touch panel.
I have two connectors of the same type. And I just took a picture of them with my cellphone(sorry for the quality, my digital camera is broken). Check the one on your board, there's a black edge on the slot. Use your fingernail to gently pull it out a little bit(about 1.5mm), like shown in my picture. Now you can insert the cable, and then you should push the locking edge back. Remember, the conductive side of the cable should be faced UP.