Simply sign in with your developer account and submit your information. You need to be a current member of the iOS Developer Program, iOS Developer Enterprise Program, or Mac Developer Program as of the announcement of WWDC (April 3, 2014 at 5:30 a.m. PDT). Developers between 13-17 years of age must have their submission completed by their parent or guardian who is an eligible member.
Randomly selected applicants will have the opportunity to purchase a WWDC ticket for 1599 USD or in local currency where available.* The purchase must be completed by April 14, 2014 at 5:00 p.m. PDT. WWDC tickets are for use by the selected applicant only and may not be sold, resold, bartered, auctioned, or transferred in any way.
If WWDC tickets are not available on your country's Apple Online Store, you will be directed to an online purchase form and you will need to make your purchase with a credit card that can be charged in USD.