Выложу пока такой способ тестировал на версии 4.0.6
В шаблон additional.css,добавляем такой код:
PHP код:
/* center avatar, username, title, rank, userinfo_extra, postbit_reputation, imlinks */
.postbitlegacy .userinfo .username_container, .postbitlegacy .userinfo .rank, .postbitlegacy .userinfo .usertitle .imlinks {text-align:center;}
.postbitlegacy .userinfo .postuseravatar, .postbitlegacy .userinfo .postuseravatar img {float:none; text-align:center;}
.postbitlegacy .userinfo .usertitle {display: block; float:none; text-align:center; clear: both;}
.postbitlegacy .userinfo .userinfo_extra {text-align:center; }
.postbit_reputation {float:none; text-align:center;}
.postbitlegacy .imlinks {float:none; text-align:center;}
.postbitlegacy .userinfo .userinfo_extra dd{text-align:right;}
/* change username font size */
.postcontainer .username_container .popupmenu a.popupctrl {font-size:20px;}