I'm on Civi 4.6.17 and Drupal 7. I've created a webform using the Drupal webform-civicrm module. I also have the Drupal webform layout module installed. I've added a new layout box (which seems to mean the same thing as 'layout container' as referred to at the Drupal webform layout module page). How do I now add fields to my new layout box? Do I need to have the Drupal Form Builder module installed as well to add fields to the layout box?
when you're on the Webform tab - you can drag and drop your fields into the Layout Box - here's what it will look like:
And re: the second part of your question - no - you don't need Drupal Form Builder. When you've downloaded and enabled webform_civicrm module - you'll see a CiviCRM tab (on the far right side) and this is where you tell the module to pull in certain Fields from your CiviCRM: