You have two options for creating your budget. You can choose to work forward and start by identifying the various lifestyle options you would like and then finding jobs that can support that lifestyle, or you can choose to work backwards and start by identifying the salary you expect to make and working backwards to find the lifestyle that it can support.
Over the next few screens, the system will ask you a series of questions about your lifestyle and help you determine the amount of money you will need to live the life. If you know how much you need to spend in any of the sections, you can type it directly in the box.