you need a premium stash tab in poe list an item for the amount you want to buy go to trade site scroll all the way down to trade filters (should be last box) where it says seller account type your account name in look for the item you listed and next to where it says direct message there is a little arrow pointing down click on it select copy whisper paste it as a dm to the person you are buying from they will use that link to contact you to buy your item for the amount you are purchasing from them.