Hi Heba!
About “yml file” see this post: How to generate metadata.yml file?.
It seems for me that you want to import the mapping file (metadata) into a Qiime artifact. Right? Can you tell me what you’re trying to do, please? It will be easier to help you.
I also highly recommend you read " Overview of QIIME 2 Plugin Workflows" and “Qiime core concepts” for a better understanding of how Qiime works and what you need to begin your analyses.
https://docs.qiime2.org/2019.7/tutorials/overview/
https://docs.qiime2.org/2019.7/concepts/
Kind regards,
Alejandro