Arduino L298N connection problem explained withpic

Pin 15 needs to be straight to GND with a very low 5Watt resistor.
what do you mean by a very low 5watt resistor?
what kinda resistor for example?
im really a beginner i dunno much about anything
i just went to electronics shop and they didnt come up with any resistor when i ask for a 5watt resistor
ok i bought 0.5 ohm 5 watt resistor