At the mid-way point, jump
on the cloud, head immediately to the right. When you come
to the end, you'll notice the line above you has two
Gordos. This is the area you want to be. Have Kirby face
downwards and the screen will shift, allowing you to see
the red star! It may take a few tries, but you'll
eventually be able to launch yourself onto the platform
and grab the red star!