Hey @angelramos. The wire connector on the Solar Charger will be placed under the screws on the terminal, on the back of the Doorbell 3. I'd highly suggest following our Help Center Article on how to install the Solar Charger for the Doorbell 3 here. This should help you get everything up and running!
@angelramos Yes, you are correct. The prongs are not inserted anywhere, rather they're placed on the Doorbell's terminal and held in place with the terminal screws. Hopefully that helps clear things up a bit.