How do you do this?
Answer: Add a blog avatar.
Step 1. Dashboard> appearance> widgets> drag across blog avatar box
Step 2. Dashboard> settings> blog avatar > browse to find the avatar saved on your computer> alternative upload if it is the correct size.
If your avatar doesn’t appear straight away, you might have to clear your cache. Here is a post about how to do that depending upon what browser you are using.
If your avatar appears as a black box, then the avatar has to be resized to fit the box. Here is a post explaining how to do this.