Since we're now using vB, we have a different infraction system, and it works differently, and I think, much better than SMF.
Hopefully, it will seldomly have to be used, but this is how the infraction system works.
Infractions are given to users for posts that violate the rules of the forum. Section Staff, Super Moderators and administrators give out infractions, but all members can 'Report' posts that they feel is against the rules.
Use this button

(

), in the bottom left of each post, underneath the user's info., to report a post.
DO NOT ABUSE THE 'REPORT POST' BUTTON, OR YOU WILL BE PUNISHED.
Infractions are (regularly) worth 1 point, and they expire (again, regularly) in 15 days.
When a user accumulates 4 points, they will be Mod. Previewed, which means they will be unable to post without a staff member approving their post first. They will remain this way until one (or more) of the infractions expires, or is reversed.
When a user accumulates 6 points, they will be unable to post, until one (or more) of the infractions expires, or is reversed.
When a user accumulates 10 points, the user is banned for 3 days, or until one (or more) of the infractions expires, or is reversed.
When 15 (unexpired) infractions are accumulated by a user, he/she will be banned for a week (7 days).
Feel free to ask any and all questions you may have.