I believe there's no way to accomplish that. Confluence have created the page with the blueprint and from what I could search, there's no bundled functionality to change a page to use another blueprint after it was created.
I've created this improvement to you: https://jira.atlassian.com/browse/CONF-35712
I suggest to vote and comment there to increase popularity.
As a workaround, you could create the new page using the template you want and just copy and paste the contents of the old page to the new one.
Thanks for this tip. But could you please let us know that label to put.
In our Confluence we have many How to explanations but they have been created as blank pages. Hence, they don't turn up in the list of How to articles. Do I understand you correctly that by putting a specific label on the page, it will turn up in the list of How To:s?
So what is this magic label to get even the blank pages in the list?
Hello again, I have found the answer, I think. In our Confluence at least, labelling a page "kb-how-to-article" makes it appear in the list of How to articles.
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