In this tutorial, we learn how to solder with a soldering iron. You will need: tinning pads, de-soldering braid, and an adding component. Start off by heating the copper, before you add the wire. You need for the acid to flow from the core onto the copper to create a surface that will accept the solder. A cold solder will break or cause burn. If you use too much solder, use the braid to remove it. Next, place the wires onto the holes and heat them onto the circuits where you want them to be placed. You may have to add some more solder to the iron if needed. Go slow with this and make sure not to damage the top of the board.

source: Wonder How To