You will need to use the English alphabet and cannot use accents from your home country language, in your case French. If, for example, your name in French is spelled with an accent over the “e”, write it without the accent in the DS-160.
Find a consulate or embassy near you: https://www.usembassy.gov/ Look for information on the embassy’s/consulate’s website for “nonimmigrant visas” as opposed to immigrant visas. As instructions vary depending on the embassy or consulate, read the website you selected carefully. Make your appointment and pay your visa application fee.