This is a WordPress plugin. It's intended to be used by developers, not end users. There's no user interface. Instead there is a class that interacts with the Kissmetrics API and a couple of helper functions.
Although there's no user interface, this is just a normal plugin. Install it in your
/wp-content/plugin/ directory. You can also install it in
/wp-content/mu-plugins/, depending on your use case.
The only way to interact with this plugin is through code, it has no UI. Before you can record any data, you have to tell Kissmetrics what your API key is. You can do this either through the
kissmetrics_api_key filter or the
For most data you want to record in PHP, you should use the helper functions
kissmetrics_set(). If you need to do something more complicated you can use the