When you first install axle, you won't have any bins to store subclips.
To create your first bin, you can click on the Bins item in the navigation column, or select New Bin from the command (gear icon) menu.
Simply type in a name for your bin and it will be added to the list. Note that bins all shared between all users that have bin access permissions.
Next, we'll look at how to add subclips to your bins.