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Ordinary comments can contain links but the original submission is either a link or text, not both.

That's my question. When I add a url it appears as plain text not clickable. How do I make it clickable?

When submitting a story on the submit page, complete the title and link fields. Leave the big text box at the bottom empty.

Because if there is text in the big box at the bottom the headline will link to it. And the headline will not link to the external site.