Where to adjust capital gain in the joint Charles Schwab stock account ?

Hi, say A and B has a joint Charles Schwab stock account, each has 50% ownership.

 

Last year the total gain is $100 for the whole account.

After i imported tax doc from Charles Schwab into turbotax, seems A's 1099-B is still reporting $100 capital gain. So where to how adjust this amount to be $50 in turbotax please ?