Newbie with their first problem...

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http://forums.oscommerce.com/viewtopic.php?p=228881#228881
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Hi! I'm really new to this, so forgive my ignorance  :wink: 

I've installed osCommerce successfully, but now on the front page I get the following:

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 Warning: I am able to write to the configuration file: /www/l/loosefigs/htdocs/osCommerce/catalog/includes/configure.php. This is a potential security risk - please set the right user permissions on this file.
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How do I set user permissions?