On my tablet, Dolphin was installed and then was set to allow downloads from other sources and to always have flash on. Also Dolphin Jetpack was installed. Flash 11.1 was downloaded and installed. However, it would never open (which meant it couldn't open the site that allows settings). The app link says "settings". What must be done to open the flash settings? This was so easy on Kindle and I thought it would be easier on the Samsung, but now, I'm wondering!!!
Running an old Flash Player (and the last working Android version was 2011) means that you're missing *several hundred* security fixes and are at significant risk of contracting a malware infection. It's a pretty bad idea.
The only good solution I know about at the moment is to run a Flash instance in the cloud and stream it back to a browser.
Puffin is the only thing I know that does this at the moment, and it runs on Android and iOS.