thats just a picture of the notes that are in the scale and where you find it on the fretboard - that doesnt mean that you have to play them all at once - that could only be done on a chapmanstick (MUAHAHAHAHAHAHAHAAAAAAAAAAA)
however - a pickup is a device that turns the vibration of the string into an electric signal which is sent to an amplifier that reproduces the tone. the pickups are the small things that are mounted underneath the strings on the body between where the neck is screwed into the body and the bridge - mostly there are 3 pickups and you can switch between them to create a slightly different tone.
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