hello!   i am looking for an app that is very simple for older users.   does heresphere have a function to lock down most of the features and could i add links to specific youtube vr 360 videos?  thanks!

There isn't a way to lock down the features, and HereSphere can't stream youtube videos in full screen VR mode (just the embedded web browser view works). You'll need to download the youtube videos. If you name the videos properly (like adding "_360" for 360 videos and "_LR" for left-right stereoscopic videos), then the player will automatically load the video with those settings. You can add those videos to a playlist if you'd like.