First, solder the components in the back, so grab the battery holder and the resistors and solder them in place.

After this, flip the board and solder the LEDs. As you can see one eye is bigger than the other, that's why I chose 5mm and 3mm LEDs to make the board as similar as the robot! Remember to check the polarity! Now solder them and cut the legs. Finally, with the legs we have cut from the resistors or the LEDs, we are going to make the antennas. Simply bend the leg and solder it in place. One in each ear.

Now simply insert a 3V coin cell battery and you are good to go