Edit main photo of my profile?

How do i edit/change the main photo of my qpost profile?

you'll want to go to this page: http://qpost.com/my/photos which you can get there by first going to your account / profile and click on "my Photos",and "Upload your photos!" . Once you upload a photo it will become your primary photo. If you upload another photo and want to make that your primary, then you will have to click on 'primary' link under photo to make it primary.