1) Go to Theme Options > WooCommerce > Single product builder > edit Upsell products element. If you tell me what exactly you want to change I could guide you in more detail.
2) I see that your site was hacked and there is malware code in the child theme functions.php. Contact your hosting provider and ask to scan your site, remove malware code and update the theme and XStore core plugin to the latest versions after that.
