Charity Corner hasn't started yet, but it has been announced to be starting very soon. When it does start there will be a main event thread on this forum that you can follow, and a link will be posted on the TDN Dailies page that will direct you to the main event page. If the process for donating is the same as it has been in previous years there will most likely be a machine that will have a donation interface. Any eligible items in your inventory will appear on a list where you can choose to donate them, which in turn will give you points based on the rarity of the item. If you have any other questions, this page should explain it better than I can, or feel free to ask if it doesn't!