Hello,
The candidate submissions page is linked to: * prominently in a big red box at the top of every election page, * in the section about submitting candidates in the rules, * in the candidate instructions section on the candidates page, * and indirectly in an announcement to virtually every mailing list for the Wikimedia Foundation.
It's not well-advertised to voters, but it's certainly not hidden. We could add a link to it from the navigation menu; we only decided not to so we could spare the translation updates for something that didn't seem to need any extra linking to.