Learn the notes in the pentatonic scale. A pentatonic scale in C has the following notes: C-D-F-G-A and then repeats at the octave.
Play these notes on the piano by finding the white key next to the set of two double keys. This key is C. D can be found between the two white keys, while F appears to the left of the set of three black keys. G and A can are the next two white keys after F.
Practice playing up and down the scale on your instrument. On the piano, use one finger for each note to make it easier to play fast. This may be harder at first, but by using one finger per note, you can increase your coordination and eventually, play quickly.