Hello Judy, I hope you will be fine and safe.
If you want to cross-posting on Medium then the first thing to note down is to own your content. If the content in the link mention by you belongs to you then all you need to do is to copy-paste the article onto Medium and follow the step-by-step process mention in the link given below to properly import your stories to Medium.
Don’t Do This Big Mistake While Importing Stories To Medium
Don’t do this mistake otherwise you will violate Medium Policies.
I hope this helps.