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Keyspaces are the units of replication in Cassandra, but you can also think of them as the rough equivalent of databases. The Data Modeling screen lists all existing keyspaces and provides an "Add Keyspace" button (highlighted) to add a new one. Click it now.
The Add a Keyspace dialog should now pop up. Enter a name for for your new keyspace, then click the "I would like to create a column family" checkbox (a column family is Cassandra's rough equivalent of a table) and click the "Save Keyspace" button.
All in the (column) family
Now enter a name for your column family and set "column_type" to "Super" (a super column allows variable subcolumns in each row). Pick data types for the "compare_with" and "default_validation class" options (I used "AsciiType" in this instance), then click the "Save Column Family" button.