The home page of your site is usually a good place to start. It typically holds a wide array of information about your product or service and will lead the website visitor to where they want to go. However, if you have other informative pages on your site that you think would be more helpful, you may want to choose one of those pages in addition to, or instead of, the home page.
In short, press request alerts are requests for sources of information from journalists. Let's say you're a journalist putting together an article on wearable technology for The Guardian. Perhaps you need a quote from an industry expert or some products that you can feature within your article? Well, all you need to do is send out a request to a press service and you can wait for someone to get back to you.
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.