You may add new content blocks to any page from your Content tool:
1. Select Content from your Dashboard navigation bar.
2. Select your Page by clicking it's title.
3. Select the green (+) icon located between all of your Content blocks.
4. A list of Content blocks are available for you, select any green tile option:
Note: Different blocks provide different types of content to your viewers. Also keep in mind that some specific page types have a different set of Content blocks available.
5. When you're done select Publish to make it live.