how to add column to column family in hbase

HBase Shell :

From the Hbase shell wiki : http://hbase.apache.org/book.html#shell

Put a cell 'value' at specified table/row/column and optionally timestamp coordinates. To put a cell value into table 't1' at row 'r1' under column 'c1' marked with the time 'ts1', do:

hbase> put 't1', 'r1', 'c1', 'value', ts1

something like this in your case :

hbase> put 'test', 'yourRow', 'person:name', 'abc'
hbase> put 'test', 'yourRow', 'person:address', 'xyz'

In Java :

Configuration config = HBaseConfiguration.create();
HTable table = new HTable(config, "test");

Put p = new Put(Bytes.toBytes("yourRow"));
p.add(Bytes.toBytes("person"), Bytes.toBytes("name"),
    Bytes.toBytes("abc"));
table.put(p);

JP Bond gave you the sample code you need - I just wanted to add that one of the nice things about HBase is since it is sparse (i.e. doesn't reserve column space for rows with out values). One of the features for this design decision is that you can create a new column (column family + qualifier) just by writing for it.