Take the bag with the electronic parts, some of them are very tiny, so don't lose them. We dropped the Fled from the design, so don't worry if it's not there:
As long as the bottom side is still unpopulated, lets solder the 0805 SMD LEDs to the top side:
Unpack them carefully and mind the polarity of the LEDs:
If you do not own reflow equipment, and must hand solder the parts, it's recommended to first add a little solder and flux to the right pad (if you're left-handed: left pad) of LED1 with your soldering iron:
Then, hold LED1 in place with tweezers, mind the correct polarity (see below) of the LED. Melt the pre-applied solder with your soldering iron until the LED has good solder contact with the pad. Be careful not to overheat the LED.
Now, that the LED is held in place, you can easily solder the other pad. A little flux helps spreading the solder. Careful with the heat!
The LED2 just goes like the first, add a little solder and flux to the right (left-handed: left) pad..
Then place the LED with tweezers. Again, mind the polarity (see below), since LED2's polarity is inverted to the polarity of LED1. Melt the pre-applied solder again until the LED has good contact with the pad. Careful with the heat!
To complete the top side, solder the second pad of LED2:
I recommend to start with the 0805 SMD resistor:
Unpack the resistor carefully:
Then solder it using the same technique as with the LEDs. Be careful not to overheat the resistor.
The next thing to solder is the 63 mA pico fuse "Fled". If you ordered a pre-production board, you can skip this part, since the Fled was dropped from the design:
The fuse "Fled" needs a bit of preparation, use pliers to bend and cut the wires as shown below to make it surface-mountable:
Then solder it to the PCB using the same technique as with the other components. Be careful not to overheat the tiny fuse.
The last component on the bottom side is the thermal fuse:
This fuse also needs a bit of preparation. Use your pliers to bend and cut the wires to make the fuse surface mountable. Make sure the fuse's body can have good contact with the PCB when mounted.
Start by applying solder and flux to the right pad. Then hold the fuse in place and melt the pre-applied solder. Make sure you don't overheat the temperature sensitive component. Check if the fuse's body touches has good contact with the PCB before you solder the second pad. If you can't align it just right, you can use thermal compound between the fuse and the PCB. The solder connections on both pads must be excellent, since they will have to carry the operating current.