#2 - April 15, 2011, 11:36 p.m.
Hi Klakk.
This feature was supported under the legacy Armory - whilst any feeds created before this new site went live will still work for the time being, there is currently no way to alter them via the new WoW Community Site, and they will eventually be removed. This is something we're hoping to port at some point into the new API.
Sorry for the inconvenience!