[SamInTheShell]

You go to person's profile. View their submissions. Use find via CTRL+F to seek out their "Show HN" submissions (or in this case, it's the top of the list because it's my last submission https://news.ycombinator.com/item?id=48970916 )

[Geezus_42]

Or you could have just included the link the first time like a normal human being.