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Did you click the "Change" button on the left?

Yes. and I got the long line of code ({"fullHash":"327fe91a0a65cdc75163377e2fcc5476b087bb462388215c54a46be59e8de8bf","requestProcessingTime":13,"signatureHash":"db65c68370d990032178b41b46c2181d527a83a1e0b49a9a6959d38f171a9277 ...... ), but nothing in the 'Found Plots'.

That's OK, you need to create the plots so follow next steps of the tutorial:) You're already registered at the pool so that's good:)