Vintage Bernina 830 Basting Stitch?

I have a vintage Bernina 830 from my grandmother. I am working on a sewing project and I need to use the basting stitch...but I don't know how to create that stitch on my machine.I have been playing around with the machine to figure out how to use the basting stitch, but so far no luck. I don't have any manuals or directions for the machine so any help would be greatly appreciated.