[alemej]

Once you find a game that supports analog you need to press F5 to turn it on.
If you are using ePSXe 1.7.0 you will see an image in the right corner that tells you the state of the analog.

I have a usb adapter to connect a ps1 controller to the pc. So all I have to do is press F5 to be able to use the controller in epsxe?

Thanks. I'll try this ^^