To get the slapback delay, basically the basic setting on a very simple pedal like this pedal, this is the Aqua Puss by Way Huge. This was a company that was around in the early 90's as a boutique company. If you have the delay setting almost all the way down, so that the speed is very quick, if you listen, the note is reacting very quickly.
And the feedback, you don't want much feedback, because you don't want many more repeats. You just want one, maybe two where the second one is even almost so faint that you can barely tell. On this pedal, this is a very typical slapback delay setting. Delay very far down, maybe 8 o'clock, 9 o'clock, feedback almost all the way down and a blend around 12 o'clock.
This is what it sounds like without it. With it, and you can play around with the other settings to your taste. Depending on what amp you're using or what guitar you're using, you're going to get a lot of different variations on those basic settings.
And of course the delay pedal that you choose to use is going to react completely different, as they're all very different and have many different kinds of parameters. But this is the basic setting where you can start, and play around with it and see what you like, and come up with your own.