You will need the Full Write Resources permission to perform this action.
Go to "More > Resources" in the left hand navigation menu and then select the "Rooms" tab. The full list of available rooms appears. Click on the name of the room you want to edit. You can also click on the "View" button at the end of the row.
Afterwards, the room details page will appear. Select "Edit room" from the "Actions" drop down menu in the upper right area. A pop up will appear where you can edit the details of the room. To edit questions, you would do so from the "Questions" tab by clicking on the question to edit.
Please read this article for more information on the fields that are editable.