robots.txt should always be at your web root, it's something you'll have to make yourself.

An example would be:
Code
User-agent: *
Crawl-Delay: 3
Disallow: /forum/ubbthreads.php?ubb=calendar
Disallow: /forum/ubbthreads.php/ubb/calendar
Disallow: /forum/ubbthreads.php?ubb=showday
Disallow: /forum/ubbthreads.php/ubb/showday
Disallow: /forum/ubbthreads.php?ubb=showprofile
Disallow: /forum/ubbthreads.php/ubb/showprofile
Disallow: /forum/ubbthreads.php?ubb=showmembers
Disallow: /forum/ubbthreads.php/ubb/showmembers

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