I've moved your thread over to Xcode > Getting Started because that's a better match for questions like this.
What platform (or platforms) are you developing for?
I am trying to create an app where you can submit something and it appears on a list that every one using the app can see.
I'm not entirely sure I understand your question. I suspect you're goal is to ship an app that anyone can download. These users can then add information to some sort of network-based database, and that information is seen by all the other users. Is that right?
If so, there are lots of options available to you and it really depends on how you want to manage the server side of this. However, before I send you down that path I want to raise one key question: how are you going to manage security? Once you have a world writable database, you have to worry about things like spam, phishing, abuse, and so on. How do you plan to handle that?
Share and Enjoy
—
Quinn "The Eskimo!"
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"