Zoho Sites - Unable to remove Zoho sites ad from footer

Zoho Sites - Unable to remove Zoho sites ad from footer

I am also unable to remove Zoho sites ad from the footer, can you please help. 

https://sitebuilder-642939377.zohositescontent.com/builder

To remove below:

Create a Free WebsiteRemove Zoho Ad

The "Remove Zoho Ad" button is not working.