Read this article and watch this video to learn how to create shaped panels for your knitted garments.
Go to stitch view in the design app and clear 6 rows or add 6 or insert 6 clear rows. Remove the same amount of columns, as stitches that you're decreasing (in the video 1 on each side).
Select the transfer tool (front to rear) and transfer 3 stitches to the rear bed at the edge of each side, using the first 2 empty rows.
Then select the "Rack 1 right+ transfer" tool (rear to front) and draw those very stitches in the empty rows above the first transfers. Do the same on the other side with "Rack 1 left+ transfer" and the remaining empty rows.
It is important not to forget to adjust the speed and the takedown when shaping. The machine needs a reduced speed to transfer successfully and a reduced takedown to limit the amount of movement of the rollers, otherwise the takedown will cause the yarn to break on those stitches. You can read more about adjusting the speed here and learn more about adjusting further variables like takedown here.