To get general information about one particular date (what it's western and chinese zodiac signs are, and what common traits are associated with those signs) enter the dates in the top line, then click 'General Information'. Chinese zodiac signs use the year field, completely spelled out (1976, not '76') and only cover years 1900-1999.
To see compatability/love information for two signs, enter both birthdates, the genders (and the years if you want chinese zodiac compatability ratings), then click 'Compatibility'). The same restrictions apply to chinese zodiac dates.
I didn't write any of this information. It's all done by the people I linked to on my astrology page