Enter pin before using litchi app

hi ,I have downloaded the litchi app and its asking for a pin. where and how do it get this pin

When starting the app for the first time after installation, you will need to be connected to Internet in order to register the app with DJI servers. Registration with DJI servers can be done without being connected to a DJI drone. The registration is done in the background, if the registration failed you will be notified with an error popup. Be aware that some Internet connections may have troubles connecting to DJI servers, in such a case make sure to try a different Internet connection (home wifi, mobile data connection, a friend’s connection, public wifi, etc).

You downloaded Litchi Magic Leash, not Litchi.
Download links for Litchi can be found on our front page at http://flylitchi.com/