If you've fulfilled the requirements for a feather that isn't automatically assigned (for example, the Card Collector feather), you can post here to have your claim verified and the feather sent to you!
If you're requesting the Card Collector feather, please make sure you have the "view inventory" custom profile field filled in! I can view your inventory without it but it's much easier if the quick link is on your profile :3
(Additionally, if you've put in a request for an automatic feather and it hasn't been approved, you can post here to nudge us to go check the page, since there's no notifications for feather requests :P)