On the Preferences page, I cannot change the email address field nor add a profile picture.
Any reason for these being read-only once someone has registered?
Because we use Single Sign On with wordpress. You can change your profile pic there and it should just sync here the next time you login.
Is it a problem for you that it works this way ? Maybe we can change it
Ah, ok. I had forgotten about the original registration.
I wonder if we can remove the access to things people can’t edit, over time. Not an issue for now, but in the future maybe 
Duncan, if you can add a profile pic on phpList.org that would be great. We will be adding you to a page listing core team soon so you will need a pic of some kind