Go to the settings app on your tablet,
In the settings go to Apps
select PerfectStitch
There should either be a storage or data section.
Under there click clear storage or clear data
Select yes that you want to clear this.
go to the perfectStitch app
it will open a page for you to put in your serial number, you should be able to find that on the back of your tablet.
the next screen will ask for a machine type. select QEZ .
Click through the pop-ups
Restart your tablet
then you should be good to go.