OK - at first I tried the usual of downloading from my computer (Browse), even to the extent of reducing the avatar to 50% of the "permitted" 175x175 pixels and only 12.4KB instead of the allowed 27 or so KB. Nothing worked and I kept getting an error message that I had exceeded something or another.
After conferring with dlb, I tried photobucket as he suggested, but somewhat different than his method. He specified the dimensions (I'd done that in the above attempt, but w/o using photobucket).
Now, the usual way I inserted pix into the site from pb was by copying the IMG info and simply pasting it into the post.
That did not work for the avatar.
What DID work was copying the Direct Link line from photobucket and pasting it in the avatar blank; that worked.
Dunno if other photo hosting (word?) services work the same, but that is what did it for photobucket.
Of course, you will have to d/l a photo into photobucket.
To get to Avatar insertion, go to your User Control Panel, then click Profile tab at the top, and then click Edit Avatar on the left side.
Oh, do not ask, 'What is it?' Let us go and make our visit.
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
Now and then we had a hope that, if we lived and were good, God would permit us to be pirates.