1. Note down the ID of the block you wish to add to checkout

2. Click "Settings" in your admin dashboard

3. Click "Checkout"

4. Click "Customize" to access Shopify's Checkout Editor

5. Click "Add app block"

6. Click the "Checkout Buddy" app block

7. Fill in the "Fixed block ID" setting with the block ID noted from earlier

8. Exit the app block's settings

9. Drag the app block to the desired location

10. Click "Save"