Click Settings under the Info Button on the top right side of your Playground.
By default, the window opened will be General. Navigate to the Account Tab.
On the Account tab you can then locate your account number in the upper-left of your screen. Your account number begins with 5KA.
You can also view your account number when you open My Generation Portfolio. Simply click once on your portfolio on the Playground. Then choose View Snapshot. Look under your portfolio name and you will see your Kapitall Generation account number.