I have a Kia year 2000 Sephia used car with dead batteries on my Parking lot.?

I tried jump start but it did not work . How to change batteries myself.How to know it is battery and not due to other problems.I have a Kia year 2000 Sephia used car with dead batteries on my Parking lot.?Does the engine crank and just not run? If yes, not battery. If no, take battery for a check.I have a Kia year 2000 Sephia used car with dead batteries on my Parking lot.?Sounds like you should get it towed to a repair shop and have it looked at