You can remove the button from your Joomla Template from TemplateToaster as well as from Joomla Backend.
To remove the button from TemplateToaster :
Open your TTR file and remove the button by double-clicking on the content section
To remove the button from Joomla Backend :
You may also delete the button from the Joomla backend, to do so you will have to Edit the page in which you added the button from the Articles section.
Then in the content part, the button will be displayed and from there you can just delete the button or the text of that button and then save it.