How do I change my avatar?

[Britanica]

I used to know how to do this but since they updated everything last year, I can't seem to find the option.
I want to be able to change it to something new/more relevant. I have had the same picture on there for 5 years now.

[Matthew]

You may open your Outlook contact, find the record related to your own and add a new photo of you. Don't forget to save your contact record after modifying.

[Chris]

It is really easy to do, especially with the newest updates. They changed the menu around a bit, but it works just fine, like it was before.