Thanks to GoldBoar for posting the player rules in the forum and thanks to AceKing for the icons.
Follow these steps to change to NL 6-max player rules:
1. Close PokerOffice
2. Download icons.rar and playericons.conf
3. Right click icons.rar and choose Extract to icons (if you don’t have Winrar, you can download it from
WinRAR - Reviews and free WinRAR downloads at Download.com)
4. Open your PokerOffice folder on your hard disk and go to res -> gfx -> icons
5. Move the unzipped images to the icons folder
6. Move the playericons.conf file you downloaded to the PokerOffice settings folder and choose to overwrite the old file
7. Start playing
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