When you first launch Money, a new document will be created for you. When you have finished adding accounts and making other changes to your new document, select File > Save and choose the appropriate name and storing location for the document. Money will save all further changes automatically.
You will also be offered to store your documents in Dropbox. If you want to store your data in a cloud for convenient access from multiple devices and have it synced automatically, you have to connect Money with your Dropbox account. You can do that before or after you save your first document.
Note: You will not be able to store your documents in Dropbox without saving them on your computer first.
Each time you launch Money, it automatically opens the document windows that you left open when closing the app. If you wish to open another document, select File > Open or File > Open Recent. If you wish to create a new document, select File > New Money Document.
Note: If a blank document appears every time you open Money, you should check whether you leave your default document opened before quitting the application. If you close the document by clicking the red X button, it will not open automatically next time you launch the app. You should leave the document open and quit Money by selecting Money > Quit or pressing the Cmd + Q keys.