To add Captcha block to your Login Form, just go to Captcha settings page, find “WordPress default” section and mark “Login form” checkbox. Don’t forget to click “Save Changes” button.
Note: Captcha will be displayed only in case if you are using the standard WordPress registration, login, forgot password and comments form.
If you are using custom forms and pages, it is necessary to add changes there, so that Captcha could work:
This article related to Captcha by BestWebSoft plugin
Additional resources: Captcha - User Guide
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