How can I add shapes to my draw.io mindmap?

I saw that there is a mindmap feature in draw.io. I inserted the shape from the Advanced library. How can I add new shapes to the mindmap?

Hi there. You can enhance your mindmap in draw.io easily. Explaining it in text-only mode is challenging, but there is a dedicated video to your question on Youtube and a blog post on mindmaps where every step is explained in detail.