Using embroidery designs from Brother’s ibroidery.com site requires that the design be linked to the machine that you’ll use to embroider the design. This allows Brother to prepare the size and format of the design that will work properly with your machine. It also allows them to copy-protect the designs, especially the special licensed character designs.
The machine ID is used to connect the machine to the design. The machine ID is unique to your machine and is different than the machine serial number.
The machine ID for the Brother SE400 is found in a Settings page using the Control panel. Press the Settings Key on the Control Panel (circled in red in the photo below):
You’ll come to the first page of settings. Press the > key until you get to the page with the machine number on it.
Enjoy your iBroidery designs.