Turning already published posts into category pages?

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  katehouck3 · Member · Oct 17, 2015 at 9:52 pm

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  I am trying to add another page to my site taking posts I already published and creating categories. This is an example, from a blog I regularly follow, of what I want it to look like
  https://5h2o.wordpress.com/category/poem-sampler/
  How do I do this? Thanks so much!

  The blog I need help with is: (visible only to logged in users)