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

hawm (Hawm) June 13, 2020, 12:26pm 2

You may have no permission to using the scripts resources by some Referrer-Policy, make sure it’s public access or others right permission.

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