Detach The front Wheel
If the bike has rim brakes open the brake.
Select a tool that fits the nuts exactly. They are most likely to be 15mm or 13mm. Note the position of any washers between the nuts and the fork. Turn one nut a few degrees to check it can move. Unscrew the nut on the opposite side of the front wheel fully. Return to the first nut and loosen it.
Remove The front Wheel
Lift the bike off the front wheel.