How to insert graph horizontal numbers

Hi community. 

Im reading this tutorial at this link, and it shows horizontal values appearing which are typed in the cell.

But I also try to do the same, but only my vertical values seem to appear. 

This is the tutorial: https://design.tutsplus.com/tutorials/quick-tip-spice-up-your-graphs-with-column-designs--vector-4025

And I try to do the same:

Thank you.