Place the leads of the capacitor through designated holes of the circuit board.

Place solder iron on the thermal pad and the lead.

Once this is done wait a few seconds until both items heat up.

Once they are heated, apply the solder to the other side so that the solder iron and the solder are not directly touching.

Wait 3 to 5 seconds or until enough solder covers the whole pad and forms a nice mound.

Remove the solder, leaving the solder iron on the pad for 2 to three seconds, then remove the solder iron.

Repeat for the other lead.