As the title states, I have been developing and testing an app for Iphone. I have got it to install to an iphone via it being plugged into the Mac. But, I would like to get
What is causing this may be that you are not enrolled in the correct Apple developer program.
A stock iOS device will only install an app from a link on a website if the app is signed by certificate from an Enterprise Developer program enrollment (or Ad Hoc provisioned). The Enterprise distribution method is only allowed to employees of the enrolled corporation.
Ad Hoc deployment to devices registered to your enrolled Developer account is also supported by stock iOS devices.
One other possibility is to put a link to your entire Xcode project on your website, with instructions on how anyone with a Mac and Xcode can build your app and then run it on on their device.