When going into a workspace and clicking on 'manage workspace' this is where you can add resources and also manage your resources too.
Pencil icon: You can click on this to edit the resource, if you click on the resource title this will also take you to the resource to edit it.
Arrow icon: Use this to move resources, you may wish to move within the workspace you are in, maybe to a different theme. However you can also move the resource to a totally different workspace should you wish.
Copy icon: Use this to copy/duplicate a resource.
Bin icon: Use this to delete a resource you don't need anymore. Please note this action cannot be undone.
^ icon: Use this to move resources up or down within a theme.
To create a theme, scroll to the bottom of the page and create a theme.
A theme has to be created first before adding a resource into it.