The counter runs entirely in your browser, so you don't have to worry about installing anything. For each counter there are 2 links: one is the admin link, the other is the public link.
You can share the public link with anyone. They will see the live counters in their browser. However, only share the admin link with people you trust.
Click on the "Add new counter" button at the top of the page
You can rename and edit a counter. To do so, click on the pencil icon on the counter.
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