Help! With Matchy Matchy Collage Gather Top Sleeves

Hey y'all! I'm working on the Matchy Matchy Sewing Club collage gather shirt in view B, the one with sleeves.

I am so lost trying to figure out the cuffs on this pattern. I just gathered a sleeve but have no idea how to attach the cuff piece correctly. The directions are confusing to me and I can't find a tutorial anywhere.

Photos attached of the steps I'm on and my mess of a sleeve lol.

& here's a link to what it should look like: https://www.instagram.com/share/p/BAfBHArVis

Has anyone done this pattern before or can you help give me some direction?

Thanks so much!