I would like to scan for stocks that do not gap up at all or scenario 2 do not gap up more than 5%

what PDF to use?

It depends on the particular definition of "gap up" being used. If you are comparing the open to the previous close the not gapping up would be:

O <= C1

And the not gapping up by more than 5% would be:

O <= 1.05 * C1

If you are comparing the low to the previous high, the not gapping up would be:

L <= H1

And the not gapping up more than 5% would be:

L <= 1.05 * H1

If you are comparing the open to the previous, the not gapping up would be:

O <= H1

And the not gapping up more than 5% would be:

O <= 1.05 * H1

Building a Scan with Multiple Conditions (7:29)
Writing Custom Conditions: The Basics (40:36)
PCF Formula Descriptions
Handy PCF example formulas to help you learn the syntax of PCFs!