Jean-

Once you’ve published a story, you’ll be sent to a page showing the title, etc. At the upper right under the title, there’s a three-dot symbol … Click on it and it sends you to “Story Settings” Clicking brings you to a another set of options—click on ‘Reader Settings’ and them under ‘Promotion’ you’ll find Friends’ Link where you copy it and paste it. I link my Medium stories to my website that way.

You also can find it under your "Stories." Each link goes to a single story.

Enjoy!