Can you learn French but in spanish?, I'm wondering that because it's more difficult to me in english. and if it's posible how can I change it.?
No duolingo is currently made for English speaking people. In the far future you may expect learning in other languages than English, but first they will probably add more languages for English speakers.
I speak English and Spanish and it doesnt really matter which language you use for the translation, knowing both is helpful with french. I took French in college in English and was very easy.