You can't, flash is not supported on the iPad - and as Adobe have announced that they are stopping development on all mobile versions of it, it probably never will be.
Browser apps such as Skyfire, iSwifter, Puffin and Photon 'work' on some sites, but judging by their reviews not all sites. Also some websites have their own apps in the App Store.
No Flash for iPads, iPhones, or iPods
Here's why there's is no Flash available for iDevices or other mobile devices. Adobe was unable to provide a product that was suitable to the needs of battery powered mobile devices used for Internet browsing. Existing Flash technology used too much memory, ate battery life, and was buggy. Simply put Flash did not work well on mobile devices.
Apple's Steve Jobs led the escape from Flash dependency when Apple introduced the iPhone, and later introduced the iPad. There was a hue and cry over the omission. Time proved Jobs was right on target.
So this is why there is no Flash for your iPhone or iPad or iPod nor for most SmartPhones. Flash has been abandoned by many sites in favor of supported technologies such as HTML5 or by providing their own custom app.
Here is Steve Jobs official comment on his momentous decision to omit Flash from iDevices: Steve Jobs on Flash.
Here is Adobe's later announcement to cease development of Flash for mobile devices: Adobe on Mobile Flash.
Now, you are not necessarily out on a limb. There are some apps that can display some Flash, but don't count on there ability to display anything using Flash.
Apps that can display some Flash from the Web:
3. Photon Flash
Also, note that many sites that use Flash provide their own app for accessing their material. So check with your favorite sites and find out if "there's an app for that."
Johnathan Burger wrote:
Adobe has stopped development for all mobile devices and google has dropped flash in android for the current jellybean and all versions going forward.
I've got a Note 2, running latest Jelly Bean version 4.2, and Adobe Flash works fine.
Just go to Adob'es website and download it.
Agree with king_penguin and kappy, you are not gonna get adobe flash player worked on any Apple device. Instead, you still can get flash files worked on Apple devices, that is, to do a conversion and transfer the flash files to files with other video formats. Maybe you can try covnert flash to MP4 for running them smoothly on your iPad.
After the conversion, you can then play flash files on any mobile device without concerning the adobe flash player~~
P.S. learn how to use flash converter to convert flash files.