Help with Frogging (ripping out)

Hi, my name is Julie Mahoney. I’ve been a knitter for years, but this problem is a first!

I’m making a long wrap (worked flat). Cast on first and then starts with the cuff ribbing K1P1 for 10 inches. It has a beautiful knit in pattern for about 110 inches in length, then you knit the other cuff still working flat for K1P1 for 10 inches. After basting the two cuff’s seams and wrapping it around my shoulders a couple of times, I’ve decided it’s not working for me and I want to just remove the cuffs. I will use it as a shawl.

Question: How do I rip out (frog) from the cast on edge of the first cuff?

Many thanks for helping this old grandma!!! (haha but true)
Julie