trouble by running 'Initialize PostgreSQL'

in postgresql-7.3.4.README there stands..
 
8. Initialize PostgreSQL (*when running under the "postgres" account*):
 
    $ initdb -D /usr/share/postgresql/data
 
How can I log on as 'postgres'?
 
If I put 'su - postgres' then it asks password, I type the password, it says - 
'su: incorrect password' The password _is_ correct.
 
Can anybody help me? Or is there another way to run '$ initdb -D 
/usr/share/postgresql/data'?
 
 
 
Olavi

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