Help understanding a cable chart. Viking Bag

I’m just getting started with the Viking Bag (free Rav download). It’s my first time doing cables using a chart, and I’m a bit confused as to what to knit on the wrong side rows. The chart specifies whether to knit or purl the wrong side stitches on the chart (indicated by blank or X’d squares, but not what to do with the wrong side of the cable stitches. I’m sure it’s common knowledge, but I have no idea. Help! Thanks!

knit them as they present themselves to you; probably all purl.

I can handle that! Thank you, MMario!