After the design is validated, go to "Actions" and click "Compile" to generate the k-code file. You can save it under any name to store it on your computer and identify it, but when you want to save it to your SD card it must be saved as ‘command.kc’ (a file with a different name won't be read by the machine).
The card must contain one single file for the machine to read it correctly.
Now, the design is ready for knitting.