How Do You Set A Picture To Your Default After You Uploaded It?

You can set a picture as your Avatar. This picture set as avatar will appear with your username and is thus the Default picture of yours at Blurtit. Apart from that, you can add as many pictures to your profile as you want under the "My Pictures" section.
How to make picture your default (Set Picture as your Avatar):
Sign in to Blurtit, Click on "Edit My Profile" words,
Your control panel will show up with Profile tab,
Scroll down and you will see the section of Edit my Avatar,
Click on Browse in that section and select any picture from your PC. The picture needs to be in ".png" or ".jpg" format. Upload the picture and it will appear as your default picture or as your avatar.