Get started from My Pages

To create a button for your page, first, locate the specific page under 'View all Pages' and select the pencil icon to enter into the page builder

Select 'Button Generator' from the Promote menu 

Here you can customize your button to fit your liking.

After you have your button customized you can copy the code in the box to the right and paste it onto your website.

Add a Raw HTML field to your page by selecting the plus icon in your page builder

Then select Raw HTML

Paste your code and select, Done!

If you want more customization controls, you can find any button generator online like this one to be able to customize it more to your styles.