The strings run between the headstock of the guitar, where they are affixed to tuning pegs that can be rotated to tighten and slacken them, and the bridge, where they're fixed to the guitar's body. On an acoustic guitar, the strings are fixed to the bridge with removable pegs, and on an electric guitar the strings are generally strung through an eyelet.
Okay, so if the diagram had O’s across the whole thing, then you wouldn’t even have to touch the fretboard at all, you would just strum it. However, this diagram has a couple of other marks on it, and those indicate where we need to place our fingers. In this case, they are on the 2nd fret of the 4th and 5th strings. The frets are the metal parts running perpendicular to your fretboard; they are what the string makes contact with when you press your fingers down. On the diagram, the frets are the horizontal lines. So count up to the second fret, and put your fingers down just behind the fret, like in the diagram.

These lead guitar lessons cover everything you need to know in order to get started with playing lead guitar. You'll learn things like: proper hand technique, the Major Scale, the Major Pentatonic Scale, the Minor Pentatonic Scale, bending technique, vibrato technique, legato technique (hammer-ons and pull-offs), and even how to play your first guitar solo! So, whether you are brand new to playing lead guitar or just want to sharpen your skills - these lead guitar lessons will help.