After you enter your authentication details and these are accepted SME will discover any RackSpace containers that are available. You can choose which containers you wish to add to your Account, and which will be the default container**. As part of this process you can choose to create a new default container if you wish, and also choose the reason.
Any containers you choose not to index / sync will not be available to be worked with an you would need to go back to the RackSpace settings from the DashBoard to add them to your account. This is also the case with any new Containers you add directly to RackSpace.
** The default bucket is what is used for interactions with Smart folders