How can I put the sidebar?

Hello,

To have the Sidebar on the Single Product page, you need to go to Dashboard > Theme Settings > Single Product > there select the Sidebar layout first: https://snipboard.io/DzCmwr.jpg

Then go to Dashboard > Appearance > Widgets > Single product page Widget Area > there add the Widgets that you want to use: https://snipboard.io/EoDxGi.jpg

You can read more about Widgets and Sidebars here: https://xtemos.com/docs-topic/widgets-and-sidebars/

Best Regards