comments+example

A simple example is our FAQ card, which has a comment box at the bottom that anybody can use (signed in or not).  If you look at the rules you will see that permissions are set so that "Anybody" can comment on the card.

view (options) not supported for FAQ

Right now you're probably reading a card called Comments, which has a +discussion section at the bottom.  That has a little comment box on it too!  Many cards include commentable cards inside of them, typically with something like this:

{{+discussion|open}}

(For included cards, commenting is only possible if the card is in open views).  Such discussion cards are all over Wagn.org.  They show up on Tickets, Features, Releases, and other cardtypes all have comment boxes.