Bubble UPnP (Chromecast / DLNA) i find is easy to use … or for something prettier i also use
MediaHouse Pro https://play.google.com/store/apps/details?id=com.dbapp.android.mediahouse.pro&hl=en
Which is also easy to use. But again requires a Source/Renderer setup (which you’ll find all DLNA software requires)
Here’s some screenshots from MediaHouse Pro
Easy Setup… plain english (below in Remote Control mode)
