Changing prices from 1st May in Calander


I would like to change prices in calander, but not possible. I wrote about it already on last Friday via Extranet but did not get any feedback yet.

Even I open one of our room and has been deleted whole occupations, so tried to closed it according booking with my hand calendar...anyway I need to put high price which I tried only for one room but if there is going to be only one guest, price is lower e.g., but  this price is not possible to change it, got a message that I should do other changes, which changes? I can not change it because of some bookings already? I need to change higher price from 1st of May.

ID Hostinec U Tajcu 5027788