Clarify on creating an avatar for Obsidian Publish

Hi everyone, can someone guide me on crating an image avatar on my homepage for Obsidian Publish.

The guide online doesn’t guide one step by step so I’m unsure.

I’d like to use my image avatar from my main website https://www.daljitnijjar.com/

so it’s on About this site - Obsidian Publish

Can you guide me?

Things I have tried

What I’m trying to do