Pull the back panel off using the highlighted tab. The tab should give you enough leverage to pull the panel off smoothly.
If the back panel is difficult to remove and feels like it is going to break, DO NOT force it. Check to confirm that all the screws are removed before attempting again.
Using the Philips #1 Screwdriver, remove the Optical Drive 4.7 mm Philips #1 screw. Once you remove the screw, locate the metal tab beneath the screw and push it outwards.
It may be useful to use the spudger to push the metal tab, as there is not enough space for your finger or plastic opening tool.
Be firm, yet gentle to avoid damaging the electronic connections.