We recommend that you clean the exposed surface of the board with a soft cloth or sponge and a small amount of rubbing alcohol.
Melt a small solder bead directly onto the metal connector on the board by placing the soldering iron onto the metal connector and then pressing solder against the tip and the board.
Once a small amount of solder has melted onto the board, lift the solder away first and then the soldering iron.
The solder bead should look like a small dome or hemisphere. If it is flat or jagged, simply place the soldering iron back on the solder to re-melt it and then pull the soldering iron away. It may require a little more solder if this does not work.
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