acf_form() function is, as you probably figured out, not specific to your theme but an ACF function to create forms in the frontend.
From the sound of how you go about things i suspect you’re not comfortable with coding a childtheme. Usually acf_form requires to be inserted manually in your themes templates.
However I just recently created a small addon which allows you to create forms using shortcodes in the editor.
Using that you can create forms for whatever group you want and put them wherever in your editor.
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