Go to Nankai Railway station on floor 2. Catch a Rapi:t alfa or Rapi:t beta(Rapi:t alfa travels to Namba in 29 minutes, while Rapi:t beta stops at several stations and takes 34 minutes.) The fare is 1,400 yen for adult. Children under 13 pay children's fare (700 yen).
Nankai Rapi:t
You can also catch an express on Airport line. It takes lonter(42 minutes) from the airport to Namba station but costs less(890 yen).
Nankai Express
Go to Nankai Namba to Kintetsu Namba