Here is the script in the new forum: How to deploy OpenDNS or How to change DNS settings on workstations
Also, I wouldn’t recommend blindly using that script without validating what it does and how it does it on the command line before trying to deploy it through BigFix. It makes some assumptions about the names of the networks instead of querying them dynamically and it tries to set them on a bunch of differently named networks even if they don’t exist. In general it might not do what you need depending on your situation.
What is the goal you are trying to achieve?