I would like to have a validation rule where a lead owner will need to write their reason in the 'Notes' section (located at the right side of the page) when they unqualify a lead. need a step by step guide for this, including the code.

I would like to have a validation rule where a lead owner will need to write their reason in the 'Notes' section (located at the right side of the page) when they unqualify a lead. need a step by step guide for this, including the code.

I need to delete a Wave Dataset(s) but I can't do that because the dataset is associated with a Dataflow.

Thus, I need to delete the Dataflow; however, I'm unable to do so??

There are no instructions for doing so and one unable to upload a blank json file to replace the existing Datflow?

I need help with this specifically, since the datasets put me over my storage limit and prevent completion of other Trailhead trainings.  However, more generally there should be a simple delete Dataflow function, as other users have mentioned.