To enter your location, open the drop-down next to 'Sunrise and Sunset', then click the button 'Get Location'. If Windows knows your location it will enter coordinates automatically.

 

For a more precise location - which may affect sunrise/sunset times by a few minutes - open your favorite map (Google/Microsoft/Apple) in a browser and right-click anywhere to get the exact coordinates. Two decimals are more than enough. (If you try different locations, remember that times are always in *your* local time, including DST if applicable.)

Whenever you travel with your notebook you may have to change the location again.

 

 

The sun rises at different times each day at any location of the planet. You can't just look it up in a table. If you are curious: we first calculate the current distance of the sun for the apparent sun diameter, add an altitude of -35/60' for Earth's atmosphere refraction, then solve the equation of time caused by the obliquity of the ecliptic and the eccentricity of Earth's orbit. Cool stuff, look it up!