Where is the createPost

When I try to use createPost like in the example, it doesn’t seem to be available. How can I use it?

const published = await myProfile.createPost({
  title: 'Quick Update from the Team',
  body: `
    <p>Hey everyone! 👋</p>
    <p>Just wanted to share a quick update on what we've been working on...</p>
  `,
  isDraft: false
});