Not sure where to stick your charger? Please review the image below:

Your charger goes right into that small concave circle on the bottom of your vibrator. Don't be nervous, it may look impermeable (and to water it is), but it is designed for the charger. 

You may still see some of the metal prong showing when you push the charger in and notice it doesn't sit 100% flush. This is normal! As long as the battery icon lights up within a minute or two, it is properly charging.

Please plug the USB portion into a computer or a UL certified USB wall charger.