Is there a place to add transmission fluid to a 2002 kia sport age clutch, mine is slipping

No transmission fluid in a clutch system
only brake fluid
and that is in the reservoir at the top of the clutch master cylinder or shared with the brake master cylinder
if the clutch is slipping it indicates the need to replace the clutch master cylinder or tor replace the clutch assembly
Clutch master cylinder is cheaper and easier and is generally the main reason for slipping clutches unless you have a cable clutch in which case replace the cable