How can I modify my pic profile in my theme?

Hey guys I have tried to modify my pic profile in blog using theme chirpy but I haven’t found how can I modify my pic profile, does anyone know can how I can modify this picture for my own picture?

listen to Me, young fellow, we do not here for a silly avatar change :smiling_face_with_tear: Could you please leave the avatar alone? is there any prominent feature or idea we could work with and share the concept with the whole world?

config

# the avatar on sidebar, support local or CORS resources
avatar: '/commons/avatar.jpg'

I have no idea what I am doing