Mapping Problem with UCR

I'm a PSNOW user, and i've already got my PS2 controller working perfectly with x360ce. But I wanted touchpad click support. So I got ViGEm and Snoothy's UCR. Touchpad works fine. The regular buttons all work fine. The analog sticks work fine. But now for some reason, I can't get the L2 and R2 triggers to work. Does anyone know EXACTLY how to set this up in UCR?