Step 2: IC Socket
Most IC's (Integrated Circuits), and consequently their corresponding sockets, have a notch on one end. In this photo, you'll see the notch is towards the top of the board. This is extremely important to pay attention to both while building the circuit and when inserting the chip during the last step.
Go ahead and solder all 28 pins in, making sure the pins are sticking out of the copper side of the board.