To enable Flash support for Safari you must update your IOS to 7.0.4. According to Apple the new software release supports Flash in Safari.
- Click on your settings icon, select general then on the right of the screen select software update.
- To install the latest version of IOS you must have over 50% battery life. (advisable to do this on mains power)
If you are still having problems a popular internet suggestion is to install Puffin browser (free)