Adding a traffic Counter widget

Hi guys

I am having trouble trying to add the ‘traffic stats widget’
I have logged into the website and looking at the dashboard, cannot see a plug-in or widget tab.
I cant see what I’m doing wrong, any help would be appreciated.
Do I need to update the version of WP?
If so, how and where do I goto backup site?

Thanks

https://ww.wp.xz.cn/plugins/traffic-stats-widget/