Make sure the battery is fully seated in the charger. If no light shows, check if the outlet is working. If the charger still shows no light, it may need to be replaced.
Once the battery is fully charged, insert it into the tool.
Select your stapling mode and make sure that the selector is properly seated. This is important to prevent unexpected staple discharge and possible injury.
Push the Workpiece Contact against the work surface first, then squeeze the On/Off Trigger to start.
Remember, safety should always be your priority.