Elsewhere on these forums, this issue has some long and confusing topics with interesting debates but not a lot of specific info in one place. I have learned from the posts here and thank all contributors on all topics I have read. Let me reciprocate and provide some updated info in one place:
Flash is an Adobe programming tool for encoding and playback and displaying animated and video content in web pages. The newer websites should be coding in "html5" but there never has been a lot of success forcing protocols on anyone for the Web or for games.
The HD+ built in browser default, when you use the Web icon, was changed from the Android "native" browser to Chrome, Spring 2013. The Android browser used a flash "plug in" you still had to add, so unless you got that before Chrome, you won't have Flash on the HD+. Chrome doesn't support Flash, anyway.
Unless you want to get into the "sideloading apps" functionality, then you can install any of the browsers that provide Flash support via their own encoding-decoding. They process it on their server so your device doesn't do the processing. Examples: Dolphin and Puffin. You also can install a "local Flash app" that makes your locally stored Flash Games work, but that won't be used for websites.
Flash is no longer supported by Adobe for Android, that is why it is so hard to find. For a true Android device, you can install "free range" apps to access Flash from the Adobe archives, but the Nooks don't allow for this.
I have installed 6 browser apps and the "Browser Switch" program, so that I can compare as I surf, and one url can be passed to another browser when surfing on Chrome and hitting a page that Chrome won't handle for me. I installed Puffin Free (with a count down of free Flash days) and just last week was thinking I might pay for the real version. Then the Free Friday Puffin App appeared, so I got it.
They all handle Flash differently. Puffin Flash loads ads as soon as I browse to a page with ads (and gets stuck and keeps looping at times...), but Dolphin doesn't do that, for instance. Puffin has choppy playback but I can pass the same url to another browser and it plays fine. Maxthon and Photon are two other browsers I have been trading out using. I really like Firefox, as it allows you to save a webpage as a pdf, but it needed a Flash add in (plug in).
I have been reading and rereading these topics since I got the HD+ during the June sale, and I finally came across a post with this link to the Browser Flash Plug In from B&N:
It can't be found by searching; you have to use that link.
It is free. Once you buy it, it appears in your Library under Apps. Tap it there, to download and install it. Open it and check your settings. Open your browsers and check for settings for plug ins or add ons, but for a browser that has "enable Flash" as its own feature, you should be able to leave that off, as you should see Flash-enabled content with either a "click here to enable plug in" displayed on the web page, or it should just run when you open a web page that requires it.
Then, using your HD+ web browser for this topic, go to these links:
Those are different tester pages. If you really are geeky, go here: