Install errors & permission

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Hi,
I'm getting green lights up to a point.

The following error message keeps appearing when I try to install with sample content.

Unable to open config/site.php for writing.

Warning: mkdir(): Permission denied in /home/***/public_html/concrete/controllers/install.php on line 201

Warning: mkdir(): Permission denied in /home/***/public_html/concrete/controllers/install.php on line 204

Warning: mkdir(): Permission denied in /home/***/public_html/concrete/controllers/install.php on line 207

Warning: mkdir(): Permission denied in /home/***/public_html/concrete/controllers/install.php on line 210

Warning: mkdir(): Permission denied in /home/***/public_html/concrete/controllers/install.php on line 213

The database is getting populated with 85 tables.

A Permissions problem?
What am I missing?

Thanks,
Nancy O.