Centre a picture on the home page

After you insert the image, then select it in the editor, and click the center icon from the editor toolbar.

There is a trick to this. If you select just the image, the center icon is disabled. You have to have (or insert) a bit of text above and below the image. If you select the text above and below the image, the image will be included in the selection and the center icon will be available. The text and the image will be centered. You can then go back and align the text correctly, or delete it if you have just added it for this purpose.