Antibot is a Drupal module that deters spambots by requiring JavaScript to be enabled in order to see and submit a webform. In order to work, you must choose which forms to enable protection for by specifying the form IDs.
Webforms have a "Content" component (a page where the form is embedded) and a "Structure" component (all the settings for the form) found under each of those areas in the top toolbar. Configuration for form fields, confirmation pages, email handlers, and more is found under "Structure." Many configuration options are available. Overview of Webform Features.