Create 3 new text blocks. Make the first and third one callout blocks.
Add your Next and Previous wording. You can rename these to what ever you like. The idea is we can go forward or backwards. You can also change up the colours.
Now we want to link these to our other pages. Highlight them, add a link and search for the page you want.
Lastly, we want to arrange them to be more like buttons. Drag the empty space to the right of your Previous button and drag the Next button to the right of that.
In this instance we don't actually need a Next button so delete it until it turns back into a text block. We want to keep the text block there though for layout purposes.
This is the part where we can also change the size of our buttons by dragging the column.