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Tada!
It should be visible AFAIK without needing to be logged into tradingview

What am I missing?

Sorry for the slow reply. I did another test following my chart link from a fresh pc and get the same result. You need to copy the chart (top right) to be able to modify settings - this will work even without a tradingview account :)

That's strange, gimme a moment and I'll make some screenshots to be sure we're on the same page - I didn't explains this very well in the article sorry. On it ...