Instructions
Go to the Facebook main page and log into your account as you normally would. When your home screen appears, click on the "Millionaire City" application on the left side of the screen to open your city. Click on the "Friends" button that is located on the bottom of the screen to see a list of friends.
Browse through the list of friends that you have that are playing "Millionaire City." Next to each friend's picture you will see some information showing you how big her city is and how much money she has in the bank. Click on the friend that you wish to donate money to to travel to his city.
Use the mouse to scroll around the screen and look at your friend's city. You will be given a $5,000 bonus each day that you look at a friend's city, so check back every day to get your bonus. Choose a location in the city that you wish to update with your money to help your friend by clicking on it.
Click on the "Upgrade" button in the window that appears when you click on the location. The cost of the upgrade will be deducted from your money and donated to your friend to help her improve her city. As a result, you will be given $100 and 10 experience points that you can use in your city.