Using a pair of tweezers remove the shield of the adhesive stripe.

Then, using your fingers as shown in pic#2, attach the adhesive stripe over the connector and on the back of the display panel. Try to maintain the connection tight: while you are turning the stripe, keep pushing it straight forward also, as you just did to insert the cable in the connector.

Note that if you still see a black empty line between the connector and the display cable as it is shown in pic#3 the cable is not correctly inserted. You have to the detach the adhesive and push it further inside!