the picture under the names are 'Avatar Images'.
Go to 'My Profile' then find 'View / Update Profile' and you will find the 'Select Avatar Image' box.
If you're really clever I think you can import them as well, but that's geek stuff I think.
Also, just under the Avatar Image box is the box for putting your 'Signature' so it appears automatically under each post.
The pictures I'm experimenting with.
Go confidently in the direction of your dreams! Live the life you've imagined. As you simplify your life, the laws of the universe will be simpler.
Henry David Thoreau