If you have never setup a Gravatar account:

1. Register / login to Gravatar. Upon registering, use the SAME email address that is associated with your WordPress User Profile.
2. Upload your photo and associate it with that specific email address. (see image below)

If you already registered at gravatar.com, follow these steps:

1. Under “My Account”, click on Manage My Gravatars
2. click on “Add a New Email”
3. Enter the email associated with your user profile on your WP site
4. Then, you’ll need to click on “Add a New Image”
5. Upload an image (square is best as gravatars are square)
6. Then select the email address, and then select your image from bottom. Now it’s associated with that email address. Click Save.
7. It will take about 5-10 minutes to propagate on the internet, and then will appear on site.