Can I reload an OV-chipkaart on a bus or tram?
Yes, but only if you have ordered credit online.
You will load this credit onto your card through the device in the bus or tram. Find a bus or tram where this is possible.
No credit ordered online?
In this case, you should load your card at a loading device. You will find these at the station or in the supermarket, for example. Search for a loading device near you.