To add a button, please go to your Website Editor.
Then, find a text box near where you'd like to add a button.
Then, hover your mouse over that text box, but don't click. Instead, use the teal plus sign from the pop-up menu above to add content above. One of those options is a button.
If you prefer that the button be below your text, you can move it down if you hover your mouse over the button and use the down arrow from the pop-up menu.
Here's a quick video to show you how: https://www.loom.com/share/73d3921c1e50433087b1c5d2a20c1e87