potty training

My sansan still not started potty training yet. she refused and always scream and yell. Today we let her yell and cry and force her to sit on potty. But she could not pee inside. Tried many times, still cannot. But now she is ok with sitting on the potty, just that she cannot pee and dunno how to pee inside. And she say 尿尿在睡觉。thats why cannot come out.funny