May I know how to uninstall Zenmate, please?

ZenMate the Gppgle Chrome plugin?

From Googles help pages;

You can also completely disable specific plug-ins. Unlike blocked plug-ins, you won’t be able to allow the plug-in to run on a given page. When you visit a page with a disabled plug-in, you’ll see the message “Missing plug-in” appear in its place.

To disable plug-ins, visit the Plug-ins page at

chrome://plugins/

You can also reach the Plug-ins page by clicking Disable individual plug-ins in the "Plug-ins" section of the Content Settings dialog.

Did you install it on your Mac or a browser as the user above replied?

If you installed it on your Mac, then it is a bit more difficult to uninstall...