Hey,

i installed the hide posters plugin and activated it

Manage Groups And Forums ->Enable ability to hide posters on this forum

Content Settings->Enable hide poster info by default on new topic form (if enabled in forum)

after that i created an new topic with user1 and viewed that topic with user2 added a reply but nothing change user1/user2 information is still displayed.

thx for help..!

This plugin requires a manual modification

http://codex.simple-press.com/codex/plugins/our-plugins/available-plugins/plugin-hide-poster/