More information about the plugin can be found in the blog post "fritzcollectd - A collectd plugin to monitor FRITZ!Box routers". The installation and configuration is described on the project's GitHub Page: https://github.com/fetzerch/fritzcollectd.
Note that the dashboard requires InfluxDB 1.3.0 or higher. Some graphs like "Daily Traffice" show "no data points" at the beginning. It may take a while until enough data has been collected.