Cron Tab: setting for every 5 minutes

How do we get a interval below 1 hour in the scheduled crons... I need the cron to look like this, to run every 5 minutes... I don't see how the WebMin interface can be used to set that... If we select 5 under minutes and all for each of the rest we get

5 * * * *

but what we need is every five minutes:

*/5 * * * *