Our Express Accounts support team will be able to help you get this figured out. Please contact them at http://www.nch.com.au/support/supportcontact.html?software=ExpressAccounts
Express Accounts should only be installed in one location -- your office computer for example. That computer needs to be running, and Express Accounts must be running on the computer [in the background at minimum - from the top menu click Accounts > Exit (Close to Tray) and that will let it run in the background.] Then from your laptop, open a web browser and navigate to the IP address that is set up in your Cloud Access. This should allow you to access the version of Express Accounts that is installed on your office computer.
As I say, your best bet will be to contact the support team at the link above and they can give you more specific instructions.