You can't, so don't even try. Now get back to work!
How Can I Unblock A Cell Phone Number Blocked By A Parent?
It sounds like you have no respect for your parents. If they blocked the number it had to be for a good reason and you need to except it and quit trying to defy them.
By trying to watch a parent put the number in or keep you phone in formation and look over and get a family member to look over and tell you later
There is supposed to be a options button and you just click on the one that says unlock