Mount the switches onto the project box by sliding each screw through a washer, the box, and switch. Then tighten the screw with nuts.
Mount the potentiometer onto the box with a washer (that came with it) on both side of the box. If the potentiometer doesn't fit, enlarge the hole for the flange of the pot by running a 7/64" or 1/8" drill through the hole. Screw on the nut to secure the pot in place.
Place the LEDs onto their holes with the positive (longer) leads facing towards the wall of the box. Then hot glue them in place.
Tin all the header pins and all the ends of the wire that need to be soldered to the pins to form good connections. Make sure to solder only onto the shorter pins of the male headers to allow the longer pins to go into the Arduino.
Hot glue the solder joints to insulate them. You may also hot glue the resistors to reinforce the the solder joints on them.
Flip the power switch to the right to turn on the Arduino.
Flip the intervalometer switch (below the potentiometer) to the right to turn on the intervalometer mode. This mode takes a picture every set interval determined by the position of the potentiometer. Turn the knob clockwise to speed it up.
Flip the PIR sensor switch to the right to turn it on. In this sensor mode, the PIR sensor will trigger when it detects a change in IR level. After it triggers, there will be a delay for it to reset to be ready again.