The diagram shows three red notes which can slide, on strings 3, 2 and 1. Practice leading up to these notes by playing the pentatonic scale. When you get to the third string play first finger, third finger and then third finger again but this time slide up two frets (a tone). On the second string play first finger then fourth finger and then fourth finger again and slide up two frets. Repeat this on string one.

When you have mastered the sliding try bending the red notes towards the ceiling until they reach the same pitch as the note one tone higher. For instance, on the third string you can play first finger, third finger and then third finger again but this time bend up till you reach the same pitch as a note a tone higher.