Captcha is compatible with Contact Form by BestWebSoft. After you downloaded, activated, and configured the Contact Form plugin, go to the Captcha settings page, find the “External plugins” section, and mark the “Contact Form” checkbox. Don’t forget to click the “Save Changes” button.
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Additional articles:
Add Captcha plugin to a custom form on my WordPress website
Add Captcha plugin to Contact Form 7
This article related to Captcha by BestWebSoft plugin
Additional resources: Captcha - User Guide
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