Please visit the United Nations YPP website (click here) and read all about the programme and apply. Simply create a log in ID (top right hand corner) and then fill out the application for ONLY one of the applications listed at the bottom of that same page.
Remember, make sure you fit the criteria and that you apply to ONLY one YPP application or else the system will filter you out! Go through all the tabs on the YPP webpage.
You can also watch videos and ask questions on UN Careers Facebook page (click here)