How can I access the locking mechanism for rear hatch

Its not that bad and you don't have break anything. First get in back (I believe only Dodge has them but )Look at the bottom center of the panel for a round plug. If there pop it out, use a screw driver and find the arm, push left or right, You will hear it click, push open the hatch. If not, then the hatch has two panels, top and bottom. Use the screw driver to pop off the top on, you'll see the seam. Start at the sides, pop them loose first, then pop out the top of it. Throw it up front. The bottom panel has 4 screws holding it in, along with plastic buttons. You can access 2 of the screws, one on each side of the upper part of the panel. Once out, you will have to pop the plastic buttons loose. Start at top of the panel, at the bottom of the window and pull/jerk it off the hatch. Just enough to get your arm down the the latch. Don't try to take it all the way out, the other 2 screws are on the bottom, no access to them. Once loose reach down and grab the latch arm Push,pull it to release the hatch. It moves easily and you will hear it click, then push open the hatch before you let go of the arm. Good luck.
Just a note.. The plastic buttons can break, Usually you can get replacements at the parts store.

Not sure about the ford but chevy has an axess you will have to look for it and mabey cut through the rug or plastic on the endgate .
But I think its a law that there has to be a way to manualy open this .really can't remove the panal with the end gate closed and the rear window hatch latched

You got nochoise you got to remove the rear panel its made to come of go easy dont break the plastic

NOT MUCH FUN TO REMOVE THE PANEL INSIDE THE CAR ON THE REAR HATCH WITH IT CLOSED BUT IT CAN BE DONE. GOOD LUCK