Insert a small flat head screwdriver into the 2 docking station guide ports on the bottom of the tablet.

There is a small tab inside the bottom of the port. Use your screwdriver to push the tab to the right until it clicks. This unlocks the bottom tabs that hold the screen to the casing.

If you have successfully unlocked it, you should see a small arrow in the bottom of the port that points to the left. This indicates which way to push the tab to relock the tabs during re-assembly.

Be sure to unlock the tabs in both docking station guide ports.