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.
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Additional resources:
If you are using custom forms and pages, it is necessary to add changes there, so that Captcha could work:
Can I add Captcha plugin to a custom form on my WordPress website?
This article related to Captcha by BestWebSoft plugin
Additional resources: Captcha - User Guide
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