Position of baby!

Melissa • Hello 🤗 , I Am Melissa I Am A New Mom-To-Be 🍼☺️, I Am 18 years Old 👑 , Yes I Am A Young Mother to be to a Princess 👑
My dr told me that my babys head is stationed at 0 but she is posterior , how do you help your baby get anterior,  Im 39 weeks & 2 days