How are members adding a profile photo?

I was told that a profile photo is only something available to the admin, but I’m starting to see some of my members are adding a photo. I’ve gone through the process of creating a new account, and did not see a way to do this.

The image is from their Gravator (global avatar) account associated with their email address.

I see. Maybe the portal popup window should mention that user photos are pulled from Gravatar?