I won't bother linking to all the previous times I've requested you add guidance text to the submissions page, including pointing them to the Feature Requests thread. I'm sure you've seen them yet prefer to leave the page sparse.

Is it intended as some kind of intelligence test on your users? In the same way as not explaining the markup system anywhere? If so, I think it's a silly test, and one your users are happy to fail.

If you haven't got the time to concoct some text, here's a suggestion:

Submit a URL with a well-thought through title to explain its relevance to your audience. Leaving the URL empty will submit a question for discussion. Please ensure submissions are relevant to Startup News; if you want Slashdot, Digg, or Reddit, you know where to find them. There's a thread for Feature Requests, so please add a post to that and refrain from starting anymore "Vote up for ..." threads. There's a bookmarklet to ease submitting, but it doesn't mean these guidelines don't apply.