You can get to the manual online. I think its on yammys web page.
https://www.yamaha-motor.com/sport/myyamaha/login/L3Nwb3J0L215eWFtYWhhL2hvbWUuYXNweA==/starthere.aspx
Basically though the top and bottom buttons just pick which odometer you want to read. The far left button will reset one if you hold it down. Cant remember how to set the clock though.
Theres also a complete service manual in pdf form that can be found online pretty easy. Im not sure if its legal or not. I have a copy on my phone so I can quickly look up torque specs when working on it.