First find the right box which corresponds to the lat/long they have given. (In this case it's easy but you may also have to interpolate between boxes).
Numbers in the columns read from left to right:
Altitude, wind direction, wind speed, temperature. To find 3,500ft you need to interpolate between 2 and 5 (thousand feet).
In this case :
05(000ft) 230° 40kts +1°C
02(000ft) 220° 35kts +7°C
If you interpolate between 2000 and 5000 you'll see that 3500 is conveniently half way between the two, so you get:
225° 37.5kts +4°C then match the closest answer.