Add recaptcha

We are using this plugin https://www.ads-software.com/plugins/really-simple-captcha/ for our contact form 7.
The theme we use has its own front end login with recaptcha.. and so without conflicting with their frontend, we want recaptcha on backend.

is this possible ? the captcha plugin shows how, but i am not a developer,
can you lead me in the right direction ? thanks