First thing to do is remove the pad that covers the screws. This is what the phone sits on when charging (on top of device).

Use a spudger or some other kind of flat tool you can pry under the padding with to loosen the adhesive and pry off.

Pry gently as you don't want to rip or tear this padding. NOTE: It is only held on with a sticky adhesive tape.

For an original Samsung charger, there are no screws. Insert a plastic spudger into the side where the rotation lock clip is (Circled red). use the charge port reference (Blue square) to locate the correct side. Then simply rotate the top from the bottom anti-clockwise.