App Modification on my Facebook Page(repost)

Hi, I have already installed a invite friend app and external link app on my page. I need the following done: 1. Friend app: Change the icon 2. Friend app: After clicking on it on the menu, I need the size to be minimized so the scrollbars disappears on the iframe. 3. External link web page: Change icon 4. Add one more of the same external link app and change the icon. 5. Show me where I can change the text for the app. 6. Show me if it is possible to see how many clicks on the the app and how many friends that are invited through my friends app.