Make sure that there's nothing on the charging plate.
Place your phone or other compatible device on the charging plate. When the white indicator light goes off, the battery is fully charged.
It's normal for the plate and phone to get warm, and they may get even warmer if you use your phone to, for example, stream music while charging.
Keep the area around the plate free. If there is something on the plate besides your phone, the phone doesn't charge, and the white indicator light blinks quickly.