How to unblock dates that are already booked

[Rachel1418]

Hello

i have a student who has booked for a few weeks. She’ll be staying Sunday to Thursday but when it was booked it blocked out Friday and Saturday night too. How can I change these two nights to being available? 
thAnks for any help! 

[Jeff158]

@Rachel1418 

Go to "Availability" and check "Reservation preferences" is set to none.