Changed working hours display

I have adjusted my available hours. How do I make some off hours show as NOT POSSIBLE instead of Red busy ? ADDITIONALLY , it seems that the hours showing don't match the changes I made?
I am trying to change Black to green, on Tuesday , Tuesday 2- 5pm to and Change black to 10 am - 12.30 pm.
I am trying to change Black Thursday showing 9.30 am _ 12 pm to Green at the same time. then Make Thursday 2- 5 p Black