[racket] Using new packages, step-by-step

I've used dherman's memoize for years.  To use it I added:

(require (planet dherman/memoize:3:1))

and changed "define" to "define/memo"

Now that I installed Racket 6.0, I'd like to use the memoize that is
referenced at http://pkgs.racket-lang.org/.

Can someone give me a step-by-step guide on how to do this?

Also, how do I then delete the old "planet" - based memoize?

thanks!
-joe
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