How to Remove #XStoreTheme Colloboration from Website

How do I remove this from my xstore theme default demo website:

#XStore Collaboration written on bottom of prefooter?

Hi

Please check theme options and Appearance => Widgets and Appearance => Customizer
Otherwise the best way to get the support is Contact your purchased theme Author. How to Contact Author and let them know because theme Author are best expert about their theme functionality.

Thanks