Flash, which is required to use the web prayers, does not come preloaded on newer Apple computers.
Flash for Apple operating systems can be downloaded at the following website: http://get.adobe.com/flashplayer/

( Deselect the McAafee option, and then click on the words "Do you have a different operating system or browser."
Select the appropriate operating system at the next window, and continue from there).

To use Flash with iPads and iPhones, you require a free app browser.
You can use that browser to run websites that require Flash.
One of the better app browsers is Puffin:
http://www.puffinbrowser.com/