Yes, you can.
When you get to Step 3,
Before you click on the Room name you will need to check the box Add Room Permissions. Now click the required Room Name.
In the case of a custom Room, enter the Room Name and check the box Add Room Permissions. Click the Create button.
4. This will now open the Room Permissions screen. You will see that you are automatically listed as the Room Owner.
You can now follow the instructions for either: