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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.
Now the dialogs disappear and your keyspace should appear in the list. At this point we're ready to enter data, but we're going to do that from another tool: the CLI (command line interface) client.