After logging into your Tiled hub, click on the circle in the top right corner of your page.
Click on Profile.
Click on Change Avatar underneath your logo.
You will then be directed to gravatar.com to help create your Gravatar.
After entering your email address (you may need to sign up for an account) you will then upload your image and fill out information related to your business for your profile.
Once completed, head back to Tiled and your Gravatar will be synced.