I have been on the EEVBlog forum, QRZ.com etc, for years, never had an avatar on them, & didn't much care.
Some time back,though, I joined a Ham group on Facebook, & after a while, they changed the rules, so you couldn't post without an avatar.
I dug around, & made my Facebook avatar a picture of my little dog, Millie.
When I joined
tea@groups.io, I was amazed to see Millie come up as my avatar there, without any action on my part.
OK, all off topic, so far,but I've become quite used to seeing the sweet little pooch appear on my posts, so I have been looking for a way to put her up as my avatar here.
All the info provided seems either to be very superficial, or to be aimed at administrators, so I am stumped.
Another weird thing is that when I registered here I was told I would receive an email-----nary a sign, & yet, here I am, fully signed up, & using the forum!