Casting on as an increase?

How do you cast on to a row you are already working on - not to start knitting but to increase?

You’d want to do a knit or cable CO. Check out the vid in the ‘Cast-on’ section. You’ll be adding the add’l sts onto the left ndl using your existing sts.

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Sometimes a simple backward loop cast on is a good one too. Different situations call for different cast ons, or you have options.