curated_breast_imaging_ddsm downloading and setting problem

What I need help with / What I was wondering
I want to use the cbis-ddsm dataset in tensorflow datasets and I have read the following instructions at https://www.tensorflow.org/datasets/catalog/curated_breast_imaging_ddsm But I feel confused about some of the introductions in it. I don't know where should I put the dataset that I downloaded from https://wiki.cancerimagingarchive.net/display/Public/CBIS-DDSM I also don't understand the commands for generate the PNG files. Where should I input them?

What I've tried so far
A description of what you've tried so far to solve your problem.
I found that this dataset should be downloaded manually. So I have downloaded the 163GB one from https://wiki.cancerimagingarchive.net/display/Public/CBIS-DDSM

It would be nice if...
There is a clear documentation about how to use the manually-downloaded cbis-ddsm dataset and how the set up and preprocess the dataset for use. Or someone can give a detailed explanation of the process in https://www.tensorflow.org/datasets/catalog/curated_breast_imaging_ddsm to help me set the cbis-ddsm dataset.

Start with the TFDS curated_breast_imaging_ddsm catalog page and the CBIS-DDSM download instructions linked in the issue. Clarify where the manually downloaded dataset belongs, where to run the PNG-generation commands, and what preprocessing steps are required for TFDS use; the documentation is done when a user can follow the process without further explanation.