Joining new ball

I am doing the big Caron cakes with the wavy pattern. How do I join my second ball of yarn and continue the same color stripes sequence since there is a striped pattern and the yarn changes colors?

You will have to find the color that comes next and cut the yarn a little before that point and join by just starting the new skein. You can tie the two ends together to keep the gap closed then weave in the ends later. I usually take out the knot, but it’s okay to leave it in if you’re okay with it.