How to refill your vape will vary depending on the type of kit you have. You may need to remove a mouthpiece or rubber plug to refill if using a pod vape, and if you have a tank, you may need to unscrew the top cap to find the fill port.
One important bit to remember is that you should never fill your vape all the way up to the very top. This can disturb the vacuum inside your tank or pod which helps keep all the E-Liquid inside and prevents flooding inside the coil and around the airflow holes. Instead, you should aim to fill it to about 80% capacity, and refill when you see the level dip below the little holes inside the coil in the centre of the pod or tank.
This will ensure that your vape is flavourful and leak-free and will help you preserve the longevity of your coils.