Hello @Miloud0,
I'm not sure what you want to change.
You can go to your calendar and change the price for dates, and change the availability to blocked or available.
Click on "Host" and then "Calendar". If you wish to see the whole month view of your calendar then click on the listing photo.
You can then click on any date that isn't booked by a guest. Then a box will appear where you can change the price, the availability or create a rule for that date. Using the start date and end date boxes you can mke your changes apply to a range of dates.
Steve.