If you want to open the rooms on Expedia, go to MANAGE / ONLINE PORTALS / EXPEDIA / SYNCHRONIZE and follow run the synchronization according to instructions below.
If you want to close the rooms, in point row Update : StopSell : please to choose YES.
If you agreed with Expedia on so called "minimum contracted rooms", and you see phrase "BASE" with number more than one in Expediacentral:
you will not be able to CLOSE the rooms via STOP SELL action for dates for which you didn't sell number of contracted rooms via Expedia.
In this case, contact Expedia Account Manager, if you need to close the rooms.