Relax. Really. The e-mail notifications are being sent out in staggered groups so that not all 3000+ entrants start hitting the site at the same time. If/when you get your notification, please log in and edit your entry slots to reflect the homebrews you are entering. When you have finished editing, I suggest you pay for your entries, since the payment has a time limit on it.
If you encounter slow response on the competition site, consider leaving it until later to try again; you'll have 3 days to pay the entry fees. You may edit the entry style, name, additional brewers, and special ingredients until the end of the entry deadline, March 17. If you do make additional edits, be sure to print the final version of the bottle labels to send to the competition.
Also be aware that this is not a mobile app, so you should be logging in from a computer or laptop. In addition, you may have problems if you use an older version of Internet Explorer as your browser.
Good luck in the competition!