How do I update my flash player.

Download the latest version from Adobe and install it.... Although there are few Web Browsers you need to do that for.

What makes you think you NEED to update Adobe Flash Player?

Whew.  You are not heavy on details, are you?

What specific web browser are you utilizing?  (Microsoft Edge, Internet Explorer 11, Mozilla Firefox, Google Chrome, etc.)

What specific web page is informing you of the necessity of this update?

Then this is what you need:
https://support.google.com/chrome/answer/6258784

You could do it JUST for that page:

The site asks to download Flash

1. To the left of the web address, click Lock  or Info .
2. To the right of "Flash," click the Arrows .
3. Choose Always allow on this site.
4. Reload the page.

To update Flash Player within Google Chrome:

1. On your computer, open Chrome.
2. In the address bar at the top, enter chrome://components and press Enter.
3. Look for "Adobe Flash Player."
4. Click Check for update.
5. If you see "Component not updated" or "Component updated," you're on the latest version.
6. Go back to the page with the Flash content. If it doesn't open automatically, at the top left, click Reload .

However, in general, if you are running Google Chrome and have enabled flash player for the site, that is about all you can do...  As Flasher Player is integrated INTO Google Chrome, not a separate plugin.