Peel back the copper ESD shielding covering the bottom of the motherboard.

Do not try to remove the copper shielding, as it is still attached underneath the battery.

If you're just replacing the micro usb charge port, there is no need to peel back the copper heatsink like in the photo, the speaker assembly can simply be moved out of the way once unscrewed. If the speakers are to be replaced simply peel back the bottom corner to expose the speaker connection. Leave the rest of the heatsink shield alone.