Unfortunately there’s no such thing. You have to add ngac.ro as a regular domain first:
After that, there will be some hassle:
Now your site will be fully migrated to the new domain.
This domain is currently on another hosting, I’m afraid this is out of our reach.
Only install plugin / theme from trusted source, avoid the nulled / pirated versions, then your site should be safe.
Again, this is a third party plugin which is out of our reach. You may ask the plugin developers about this issue.
I see how you are using mail.ngac.ro as your mail server — unfortunately there’s no free email here, you have to find a seperate email hosting service.
Moreover, since you have the need of SMTP, you are expected to pay a little money on this. Some free email services like Zoho, have no SMTP on their free plan.
It is possible that you change the nameservers back to original and add the necessary records so you can continue to use your current mail servers.
As for adding captcha, it depends on how well your plugin supports captcha. Normally it might support google’s recaptcha, but you still have to seek for the developers’ help.