I did see that page already and in particular this section:
The type of Estimation Statistic you select affects which units are used by the 'Estimate' field, which appears at the right of each issue inPlan mode: (Note that the 'Estimate' field is editable when an issue is in Plan mode, but not editable once the issue moves into Work mode.)
The estimate field is not editable for me, assuming I'm supposed to type into the grey oval on the right end of each card. I can't figure out how to type in the story point.
What if you go directly to the issue itself and try to edit it from there? You can always check if you can do it in the issue itself.
You might want to add this add-on too to figure out your fields:
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