[quote=sarah;1316233I am pretty clueless about cars [/quote]
OK well theres usually a little flap thing at the back, and on some cars you put your key in and theres a cap you can unscrew,
http://www.envirogas.co.uk/img/images/capfull.jpg
its sort of the "done thing" to go to a thing called a "petrol station," which can usually be identified by a big lit up board outside with things writted on it like "unleaded" and "diesel."
https://www.cs.tcd.ie/Kenneth.Dawson...ts/Garage1.JPG
When you find these things you can unscrew the little cap thing and put some fuel in there, I'm sure the people at the petrol station will be willing to help if you struggle with that
(yes, I am very bored)