Hi!
There is no uninstall function, but I don't think this would be demanded as the plugin is really simple and you can always disable it by turning the product off or uninstalling the product.
If you uninstall the product then the database remains modified with the field "css" in the forum table. You could delete this field manualy.
The code to do it is:
PHP Code:
ALTER TABLE `PREFIXforum` DROP `css`
Best Regards,
Jan Jaap