This is not about how to watch but from where you can get the desired movie. You get to know here that a particular movie is available in Hindi but how can you get it.
Amazon Prime is one of the most probable platforms to get Hindi dubbed movies,
Netflix will be the second most probable platform.
Google Search / Random Downloading Sites can be the last option for you to try out and watch it.
One thing be sure if a movie is listed here in as Hindi Dubbed Movie, it is definitely Hindi dubbed
Tips: Ge help from geeky friends of yours to know more about 'Where to Watch These films'