I want to stick with my ISP DNS servers for PiHole - how do I make those changes?

I want to set my primary and secondary for PiHole to my ISP's DNS servers.

How do I achieve this after installation?

Run pihole -r and choose "Reconfigure" from the menu.

I ended up manually edit the piholeDNS1 and piholeDNS2 values in /etc/pihole/setupVars.conf and the run pihole -up to read them in!

I tried running pihole -r and choosing custom but that didn't do anything.