child adoption

Dear sir regards I had adopted a child which is11 moths a baby girl i had signed a foster care custody agreement with the shishughrah n the girl is with me since last 4 month with me how can i get the legal custody n where should i file the application to avail the legal custody of my adopted child is it from the city where the sishugrah located or the city where i am staying and within how many days i can apply for the legal custody of the child after foster care agreement starts.