where is the freon refill port by the compressor or at the right top end

The refrigerant in your car's system is R134a not freon (R12), the service port connections are larger on the 134a cars you may have the high and low pressure ports all ready found if not, Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. and get an online repair manual subscription.