Salut Monica ,
By listening a lot to spoken french through different medias (films,songs etc)
Reading loudly and being corrected by the help of audio lessons or a life tutor .
Speaking with french native speakers in real life or online using chat programs such as italki; that helps very much catch the correct accent .
The french accent is quiet peculiar, specially the pronunciation of the vowels, so it needs a lot of practice and constant repetition of the peculiar tones
Bonne Chance :)