Place the 2x20 female header in so the connector is on the bottom. To make it easier to keep it in place, you can use some tape. Tacky clay also works, whatever you've got handy!

And Solder!

Be sure to solder all pins for reliable electrical contact.

(For tips on soldering, be sure to check out our Guide to Excellent Soldering).

Start by soldering the first row of header

Now flip around and solder the other row completely

You're done with the header strips.

Check your solder joints visually and continue onto the next steps

Next we will solder in the 2 3.5mm terminal blocks used to connect speakers to the Speaker Bonnet. 

Make sure the open parts of the terminals face outwards so you can easily connect wires.

To make it easier to keep these in place, you can use some tape to hold down the two header pieces. Tacky clay also works, whatever you've got handy!

Solder in each block, make sure you get to each of the 4 pins

Now that you're done with the terminal blocks, check your work make sure that each solder joint is done and looks shiny

OK you're done!