Can I use Hik-connect to access my nvr from outside of my lan using my android mobile, if so can you give me instructions on how to do it or point me in the direction of a web page that gives instructions.
yes, if you enable Platform Access/P2P in the NVR network settings you should be able to access remotely with the app, the below forum posts and resources should help:
Hikvision's standard App for use with their security cameras and recorders is called Hik-Connect. It is available for both Android and Apple's IOS based mobile devices, from the usual App stores. For Android devices, from the Google Play store here...
It's a bit clunky to use (insists on opening new tabs), but this online help/manual for Hik-Connect portal and (the Android App) may be helpful for some: Help