renaming x axis values on graphs

L

libertyforall

How do I rename the x values on a graph instead of having it
simply correspond to the row numbers? I tried clicking on the x axis
properties and I see some options but I can seem to manually enter
what I want to appear. I have 17,000 cells of data and it simply has 0
- 17,000 in 2,000 increments. I would prefer to have it listed in
months or at least 1 - 12 but I can't seem to be able too.
 
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