Sorry you're encountering issues with CRMint. It seems like you're trying to update the cron for your pipeline but it won't let you edit it.
In CRMint, you cannot edit a pipeline while it is scheduled (the Run on Schedule toggle enabled). To make changes to the pipeline (or even the jobs within the pipeline), you have to first disable the schedule (untoggle the Run on Schedule toggle), make your changes, save them, and then re-enable the schedule.
Fortunately, in your case, the Training pipeline from Instant BQML is already defaulted to a weekly cadence (Saturday's at 8pm for you), so no edits needed there. The Prediction Pipeline needs to run daily to score users from the previous day in it's analysis (however, you can modify and change the code to your desired architecture).
Please let me know if you have any other issues. Thanks for reaching out!