How do I review an iPhone application for the App Store?

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Advertising interruption done, let's look at your question! :-)

There's one way you can rate an application from your iPhone: delete it.

No, seriously. If you go to delete an iPhone app, it invites you to rate it as you're proceeding:

That's not very practical, especially if you actually like the application!

The secret, therefore, is rate it within iTunes, not on your phone.

"Ahhh, okay" you say, "but how do I find an app that I've already bought?"

I can help you out with that. Let's start at the beginning, though.

Start out by launching iTunes (Mac or PC) and look on the left side. You'll see this:

Click on "iTunes Store". Now, on the top right, you'll see a search box. Type in the first few letters of the app's name or a keyword that describes the app. As you proceed, you should see iTunes offer suggestions, as shown here:

When you've entered a few characters or even the full name of the app, press Return and you'll see the matches shown:

Good. Click on the one you want. For this example, I'll click on iHound as I've been meaning to leave a review for the app anyway.

Now on the left side, just a little ways down, you'll see:

If you just want to rate the app with 1-5 stars, just click on "Rate this".

What you probably want to do, however, is actually write a review. To do that, look a bit lower down in the middle of the iTunes window. You'll see something more akin to this:

Can you guess what you're supposed to click on? Yep, on "Write a Review". Do that and you'll see:

Looks good? Click on "Submit" and you'll get this confirmation:

Done. Congratulations!