I need assistance with my capcha plugin or suggestion

HI I'm wondering if someone can help me with the captcha plugin I'm using called: fun captcha as it's not working properly. or if you may have a plugin suggestion as I am receiving so much spam registrations and I'd very much like to prevent that.

Any assistance would be so wonderful.
Domain: http://www.latenightgroup.nyc

Thank you so very much for any assistance.

Mark Moore