I am having difficulty logging in from an iPhone. Should this be done through the browser, or is there a special app?
Yes, you should use the Browser. Our online program works very well on all apple products using a browser (Safari, Firefox).
We do have a mobile site but it is only a utility to find/search for addresses in your CMO program the URL is:
https://www.churchmembershiponline.com/mobile/mobilelogin.aspx