How to access your iCloud documents on an iPhone?

I can't figure it out! I have an iPhone 3GS running the latest operating system, and the new iMac. Help me, please

Added (1). @David iCloud is set up on my iPhone, but it won't let me access the website for some reason.

You make sure the iPhone is registered to the Apple ID that the Mac is used for iCloud access, then you just run the appropriate application (e.g. Pages for iOS to access Pages documents created with Pages for OS X).

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