According to previous posts in this forum, it should be possible to insert custom Javascript code into the or fields of the default theme, but whenever I try to do so, I get a popup saying “403 error”. Given that I am the admin but not a developer, how can I add my one line of custom Javascript?

Inserting Javascript yields 403 error

merefield (Robert) August 16, 2022, 1:07pm 9

How about Head not Header?

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