UPDATE ERRORS

Hi,

You could try to add that code in this file – https://www.screencast.com/t/wHvfKgGu
But I could not say if your plugin will work or not. Maybe it is simply not compatible with the theme or with another plugin. You could always search for other plugins with that kind of capabilities and see if they work properly.
For the scroll up button while using the mobile theme, you can try this code

.td-scroll-up {
display: none;
}

The code must be entered in Theme panel->Mobile theme->Custom Css

Thanks