I wanted to customize video player into the Mobile app and wanted to do some changes in reg page

Hi All,
Wishing you Happy Christmas. May God Bless us.

we wanted to change reg form values in mobile app in website we have done that part easily but we are stuck in mobile app please suggest.

Second one we are stuck with video screen resolution according to internet speed please guide us. How we can acheve this in mobile app we have successfully done this thing in website but facing difficulties in mobile app please suggest how we can do it. We are using Nutmeg.3 Tag in our production .
Thank in advance.