There s no FSAA controls in ePSXe,
U can enable it using a tweaking program (like NVmax for example)
u can find on
www.the-ctrl-alt-del.com
or simply use the configuration panel of ur video card.
D/L the latest drivers for ur geforce, and then click on the advanced button whch is on the graphics parameters of ur display properties
Then u should be able to see the FSAA control.
Enjoy.