You can only create a room if you assigned a device to it first. Rooms will add to the Devices by Room tab as you pair them with devices.
From the Device by Room tab, select No Room. You will then see all the devices without a room. Select a device.
In the device’s settings, select the Room field and press + Add Room.
Select one of 26 room categories. Name the room and press Save.
The category determines the icon of the room. The name is used to identify the room and add precision under the product name.
To see the room you have just created and the devices linked to it, press on the Room tab on the Devices screen.