Before disassembling your BLU Energy X Plus, make sure it is powered off.
Flip your device to the left side facing up and take out the SD card tray using the SIM card eject tool. You will insert the tool in at an angle and lift the tray up.
Flip your device to the right side facing up and use the SIM card eject tool to remove the SIM card by pushing the tool in the hole. You will feel a button click and the tray should slide out 2mm. You will then use your fingers to pull the tray out.
Take the blue plastic opening tool and insert it in-between the back of the phone and the chrome trim. Go all the way around the device slowly to take the back cover off.