Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.
The problem must be quite annoying. I hope I can help advise you how to get the Kindle to display in English instead.
Please tell me how far you got with the Kindle before it turned into (or, turned out to be in) French ? did you complete the setup and choose the language? or did you find it in French, from the beginning, period? (and if it has always been in French, what is on the screen now? in point of entries, or heading text, or something to distinguish where you are in the initial setup.)
I understand French, so if you tell me roughly what is in e.g. the heading text, I can tell you what it means.