How did my users upload a profile photo in WordPress?

Solution:

By default, WordPress uses gravatar service to display user’s profile picture. Users profile picture is based on your email address. If users do not have a gravatar account then your profile picture will be replaced with a default image placeholder which is called “Mystery Man”. this is how user can set their gravatar picture.

  • Visit Gravatar website.
  • Sign in to Gravatar with your WordPress.com account. If you don’t have a WordPress.com account then you need to create one.
  • Upload your avatar (profile picture).