Once you Install a new Application you have a option to review it and you need to make sure you write a real review rather than just some useless review which cannot be helpful for other readers. Iam sure whenever you buy a new iPhone App you would first read its reviews and ratings given by other users because this can be the only available option on your iPhone to know if the iPhone App is worth the money or not. Many a times there are new Apps launched and you may be on of their user, hence its recommended to add a Review for this because it can be helpful to both the App seller and also the future downloaders.
If you add a review with some bugs with the Application, it can hit some sales of the Application maker but well he can make sure the next version is Bug Free and he can release the updated version as soon as possible. Also when someone is looking to buy a new App he can read all the reviews added by others and then decide whether he should buy or not.
In order to add a review you need to login to iTunes and locate the App for which you want to add a review. On the very same page on iTunes you will find all the Customer Ratings & Reviews along with a link to ‘Write a Review’. Though there are some bugs in this system, where in you will find some reviews already made by users along with a message of No Reviews till date. Once you click on the ‘Write a Review’ link you will be asked to enter your login credentials for the Apple Account , which when entered you will get a form with all the details to be entered for writing a great review.
The Review form will include 5 point star rating system with Title and 6000 characters limit description. Make sure you add a real review and not any fake one which would mean that you should not add any wrong review. Seems like all these reviews are reviewed by the authorities before they are posted on the Apps Detail pages. You will be asked to confirm the message you are trying to add in the review page. Once done your review will be sent it will be submitted and after a while you can find it.