Basic Questions – AntiSpam + Template Creation

Dear All,
how can I integrate FunCaptcha plugin to prevent annoying spam registrations into “user-registration” page?
I’m not able (yep, I’m a bit unskilled) to find the “template page editor”, also to build for example an iframe page without a sidebar and so on.

Basically my questions are:

1- How can I integrate FunCaptcha plugin into the registration module?
2- Where I can edit or create a new page template?

Thanks!