To make a Quick Change to the Availabilities of your OTAs in the Schedule :
Click on Schedule in the Main Menu,
Click on the offer of your choice on the My Schedule page ,
Click on the Channels button.
Select the channel for which you wish to make the change.
Tick the offer(s) concerned.
Use the mouse to select the period concerned :
Day by day, by clicking on the given days
Week by week, by clicking on the week number
Month by month, by clicking on the cross to the left of each month
You can also combine specific days with several weeks and one or more months
Choose "Open" or "Close
Then click on "Confirm".