Override DNS places entries in /etc/hosts of each test engine so a hostname in your script is resolved to a different IP address during your test. This allows you to "point" your test at an alternate server without editing the script.
Slide the toggle to "on" for DNS Override and then enter the hostname and alternate IP address:
CAUTION: Do not include http:// or https:// in the host field. As shown in the image above, the host should be entered as hostname.company.com instead of https://hostname.company.com. If http(s) is included, the override will not go into effect.
You can override as many hostnames as needed. Just press (+) to add more.