I have a Viseo smart TV I also have amazon prime how can I watch on my TV ?

How to watch Amazon Prime Video on TVs Smart TVs and more
See this video.

Open Amazon video application (if is not preinstalled download it from application store of your Smart TV)
Register your Smart TV: select Sign in and start watching OR choose Register on Amazon web site to get a character code
You Need to be already subscribed for Amazon Prime before you do anything on your device (do it online not on your tv or device)

hi Sylvia.
this is all i could find out.
You can get the Prime Video app from the Samsung Smart Hub:

1. Press the Smart Hub button on your TV remote.
2. Select Samsung Apps from the menu.
3. Select Prime Video.

Watch Prime Video on Samsung TVs - Prime Video: Help

or read up more at this link.
How do get amazon prime app on my smart TV Google Search

How to share Amazon Prime with friends and family

Amazon.com Help: About Prime Video

www.amazon.com/gp/help/customer/display.html/?...

Amazon.com, Inc.With an eligible Amazon Prime membership, you have access to thousands of PrimeVideo titles at no additional cost. To find Prime movies and TV shows on your connected device, look for the Prime Video or Included with Prime categories on the Amazon Video Home screen. You can also use Search to find a specific title.‎Watch an Amazon Video Title - ‎About Watching First Episodes

Amazon.com Help: About Prime Early Access

https://www.amazon.com/gp/help/.../display.html?...

Amazon.com, Inc.Prime Early Access is a feature that gives Prime members 30-minute early access to Lightning Deals on Amazon.com and new sales events on MyHabit.com.

Amazon.com Help: Watch an Amazon Video Title

If you mean on a smart tv then you should be able to download the amazon prime app to tv then input your login details.if no app is available to your particular machine then go to your browser ,type in amazon prime address save it as a bookmark.if you are in uk it is worth noting that you can login to the USA amazon site .com and then google tunlr to input the secondary DNS settings.as long as you keep paying the subs they don't seem to mind who watches.more films tv etc on the .com version.