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Find the button Show the list of Users in the left hand menu bar. Press this to bring up the list of users set up in this instance of PhixFlow. Double-click on your user (Train) to bring up details for your user. Update the Default Dashboard setting to User Course: Unallocated Payments. Press OK to save your changes.
Log out and log back in. You should see your new default dashboard appear as soon as you have logged in. (You may need to press Monitor to make your new default dashboard appear after you have logged back in, or even Reload Application from the Admin menu – ask your trainer about this. Different browsers cache different amounts of information about applications like PhixFlow, so this varies.)