Tawk.to Fresh install issues.

Hi there.

I have a fresh install of OpenCart 2.3.0.2
and just installed the Tawk.to extension.

The tawk.to extension installed fine, but to configure it properly it asks for the script from tawk.to.
When I put the script in, and clicked save, it gave an error message.

Permission Denied!

You do not have permission to access this page, please refer to your system administrator.

Considering this is a fresh install of OpenCart and tawk.to; I'm confused as nothing has gone wrong up until this point.
Any advice? Thanks in advance.

You could go to user permissions and set the permissions for the extension if they arent set. Make sure tha tawk.to extension is compatible with your opencart version.
Or , just get the tawk.to code and paste in in catalog/view/theme/yourtheme/template/common/footer.tpl before </body> and you dont need the extension anymore.