You can change the order of the blocks by moving them across a page.
Moving blocks on a page
1. Hover over any block and click on the icon in the top right corner:

2. In the new window pick a block and move it to the relevant place on the page by clicking on the arrows icon:


Important: You can only move blocks within a single page. To copy a block to another page on your site, see the article
Copying a block.
3. Click on cross icon at the top right corner to get back to the editor:

4. Publish your site for the changes to appear live.