the text is in a boolean (Boole) with the cloned cubes. The boole is set to Intersect so you will only see text where there is both text and cubes in the same space (intersecting).
Try turning off the Boole (click on the green arrow beside the word, it will turn into a red x) so you can see where the cubes and text are. Change the text to whatever you want, then as Jim said, increase the width and count in the Cloner so there are enough cubes in a wide enough area to cover the text at it’s new size. Then turn the Boole back on.