There, I can't put it in your post, but that's your icon.
Yes, alternating rows of knits and purls makes garter stitch. You might try looking at youtube for some help too. Various loom might look a bit different but it seems they all work in the same way. I've seen things about how to loom knit a scarf there. Also, searching on knitting board
might produce useful results. Whatever you do, I hope you keep us updated on your progress.