I found the Anycubic repository on github, and looked at configuration.h to find a few starting values for the configuration. I put these values, and a bunch of “reasonable guesses” into the RepRap Firmware online configuration tool, and downloaded this zip file
Since I did all that, you don’t have to… the above is so that you know how it happened if you ever want to re-do an initial configuration for a slightly different printer. Instead, just download the zip file (last link above).
You can look inside it if you wish… but the real goal is to upload it to the Duet board.
In the “Getting Connected” guide in the prior step, you learned how to open the “Duet Web Control” (DWC) to your printer. Open that now.
Navigate to SETTINGS, the GENERAL tab, and click the a large blue button “Upload File(s)”. Upload the entire zip file. (Do not unzip it).
The Duet will offer to reboot. Click OK.