To connect on the nanosaur web interface you need only to connect at:
Windows If you are working on a windows operative system, check if is installed Bonjour.
Bonjour is an Apple a Print service, that provide the mDNS detection able to resolve .local addresses.
You will be connected to a web browser on the nanosaur robot, and you will be able to read the status of the robot.
Pressing the menu button 
(top left) will appear a list of topics available, like the picture below.
This is an example with the final output, with these topics anabled:
- image_raw
- diagnostics
- cmd_vel
This rosboard is provided from an amazing open-source work, made by @dheera!