I tried to implement the below extension on Expression Engine. It is loading fine on the registration page. But I can see a text box along with this recaptcha box. Can any one explain me how to remove the existing text box?
You have an extra form input for the CAPTCHA that you do not need.
<input type="text" name="captcha" value="" size="20" maxlength="20" style="width:140px;" />
The ReCAPTCHA extension will dynamically create the form input for you in the
recaptcha_container div, so you can remove that input from your form.
Try going into the admin control panel->Members->Member Preferences, then choose "Enable Membership CAPTCHA" -> "No"
Apparently the recaptcha plugin does not function if disabling the native EE captcha function. I'm using the strike-through here in case anyone can benefit from this knowledge in the future.