Read this article and watch this video to learn how to create single jersey.
To create a single jersey structure in the software, go to Stitch view.
The canvas is made up of front bed single jersey by default. Single jersey can be knit both on the front bed (which looks like knitting in hand knitting) and on the rear bed (which looks like purling in hand knitting).
Open the stitch selector in the toolbar on the left, and select the stitches to create single jersey as below.
You can choose to only knit on the front bed: 'Front Knit' and 'Rear Miss' (left) or only on the rear bed: 'Front Miss' and 'Rear Knit' (right).
Select the drawing tool you need (pencil, line or rectangle) and draw. Below a detail of single jersey on the front bed (left) and on the rear bed (right).