How to set horizontal series?

[CrimsonCoure]

How would I change the horizontal series from '1' to different columns, such that they're listed 1-12? For context: In order to create a functioning Box & Whisker Plot, I had to restrict my data to 4 columns and then add the remaining 8 manually with 'Select Data.' However, it's showing all 12 columns in a single series. The legend shows which column is which, but I'd like to have the column numbers 1-12 listed for the horizontal series instead of just '1'. How would I go about doing that? Thank you in advance!

 

[CrimsonCoure]

Using 'Select Data' to change the 'Horizontal (Category) Axis Labels' to 1-12 lumps all the columns in to '12' and shoves them over to the left-side of the graph, so that won't work. I'm not sure what else to do.