External DNS forwarding query imbalance

so do i edit this .conf file? e.g. using nano?

Then "pihole -r"?

If so, how do i configure additional IP4 addresses?

For example, can i set "PIHOLE_DNS_3" to an IP4 address?

Can i add additional PIHOLE_DNS lines? e.g. "PIHOLE_DNS_5="

Thanks.

sudo nano /etc/pihole/setupVars.conf will get you into the editor. Make the changes, save and exit.

Then sudo service pihole-FTL restart will restart FTL.

Yes. Change existing lines as needed, or add new lines, or both.