You can't! It is so frustrating. I mean you can buy it but your taking a risk of not getting the answers you need, or paying asking price. I have found if it is an awesome price for something fabulous and they will not respond to you, then it is usually too good to be true. Another thing I do is go check out their profile or account. If they don't have anything else for sale then its probably a fake account. You see all of these negative post about Poshmark and their bad purchases and how poshmark won't back them up. Well you have to take responsibility for yourself as well. I do my research before purchasing ask the questions I want answered in writing, and take the best pics I can, close up and every angle whether I post them or not... back-up!