On joining you are given a default profile picture, a non-identifying image that is assigned to you and often used with your user name.
You can change your profile picture to an image of your choice by uploading an image file or picture from your desktop. To do this, go to My Home Page, and click ‘Edit pic’, then browse to go to the image you wish to upload from your computer. Alternatively, you can select from several block colours.
Remember that Big White Wall is anonymous and so profile photos should not identify you in any way.