The number id001 is your device's default namespace.
By default, the magnetometer is disabled, making the sensor output relative. To enable the magnetometer and perform calculations based on magnetometer calibration, set the operation_mode parameter to IMU
All topics shown are publishers, meaning that they publish data to the ROS network. In the command line interface you can verify that they are in fact publishing data using for example:
Visualize the data and change the parameters like IP, Topic Name, etc using the embedded web interface. You just need to open your browser on your host computer and enter the IP address of the device. If you didn't change the default IP address, then it must be 192.168.7.100.
Change all ROS related params with rqt or the ros parameter server