Its very simple to set reCaptcha in WP User frontend Pro. Just to navigate to WP-admin>User Frontend>Settings>General Options then you have to insert reCaptcha public key and reCaptcha private key and click the save button and you have done.
We did all that you suggested above and this is how our form looks. Notice the bottom where we added the recaptcha to the form with the text “Prove You're Not a Robot” but no reCaptcha. We have the latest version of your plugin. It worked on the previous version but not this. Are we supposed to install a 3rd party plugin to make this work?
Sorry but I guess we're not communicating well. The WP reCaptcha Integration plugin works fine on it's own or independent of WPUser. It displays on the WPUser registration form we created and works great. But we didn't add a reCaptcha filed to that same form. The plugin put the reCaptcha there through on of it's settings.
I'm wondering why when I add WPUser reCaptcha field to one of our basic forms or even that very same registration from that it does not work. Really Simple reCaptcha works fine when I add it to your forms but not the WP reCaptcha Integration plugin.