If all that is needed is a textarea, it will be much easier to code this yourself.
1. Create a custom page template for the page
2. Code a
<form> that contains a textarea field
3. Add some PHP to the top of the template which can detect if the post has been submit
4. If a submission is detected, run some custom logic.
5. This logic can use the
get_field function to get the repeater field, and then append a new row using the posted textarea value, and the current logged in user ID (from a WP function), now just use
update_field to save the repeater value.
Please read the docs for both update_field and repeater.
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