@parveen: Here's a link to the Prep Guide for the exam: Prep Guide Exam 70-480. If you follow the link there will be a Schedule button to the right on the page. Follow that link and you should be able to register. Use HTMLJMP as a promotion code when you get to that part of the registration process.
@Steve: We understand that HTML isn't everyone's preference for developing desktop apps. We're busily working on putting together a Jump Start to cover app development with C#/XAML. Hopefully, we'll have something to announce by the end of the year. Stay tuned.