The operational range of PSoC 5Lp is 0 to 5.5 volts. So the voltage on the pins should not exceed this limit.
What is the voltage on the pin you are giving and what is the voltage you are expecting on the output?
IF you are wanting a comparator output, then connect the + input to a VRef that is NOT VSSA, and do the Opamp_1_Start() call.
If you want an amplifier, then....
What gain are you wanting? Once you know, you need to route the Output to a Pin on the PSoc, then route the - input to a Pin on the PSoc, and then the + input to a Pin on the PSoc. Then, attach R2 to the Output Pin and the - Pin, and then attach R1 to the - input pin. Then attach your signal to the Input of R1.
Finally, take the + input and connect it to ground on the PSoc. At that point, you have an inverting op-amp with a gain.
A tutorial for op-amps is available here: https://www.electronics-notes.com/articles/analogue_circuits/operational-amplifier-op-amp/inverting-amplifier.php