How do I sell stock out of a UTMA account now that I am an adult?

I recieved the stock as a gift when I was 12 years old. I am now 25 years old. I recieve the shareholder notices & 10K forms every year. They are directed to Grandma - CUST Myself UTMA Indiana. I would like to transfer the shares to a brokerage account that is in my name only. Is that possible or do I have to sell them?