With the back cover removed you will get a view like this.

Use the Phillips 00 screw driver to remove all visible screws. Try to organize the screws so there is no confusion when reassembling the phone.

6 silver cross head phillips #1 4mm screws circled in red.

5 gold cross head phillips #1 4mm screws circled in yellow.

1 black cross head phillips #2 2mm screws circled in blue.