how they did this( allow user choice the avatar not upload)

reglster

i'm searched the community, almost the answer is you can not do this ,but when i tried this forum, they did it.

when you click "change picture", you got this:

when i check the source code found this:
<link rel="stylesheet" type="text/css" href="/plugins/avatarstock/design/avatarstock.css?v=1.2.2.57696e31" media="all" />

is this addon? but i cant found a addon named avatarstock or any post include "avatarstock"

jackmaessen

Probably they have created that addon for themselves and did not share it with the vanilla community.

hgtonight

This appears to be a hosted only addon called Avatar Pool: https://support.vanillaforums.com/discussion/5765/is-it-possible-to-define-a-preset-of-avatars-we-create-for-our-users-to-choose-from-hosted-version

This seems easy enough to create, go for it!

Plugin quickstart: http://docs.vanillaforums.com/developers/plugins/quickstart/