[TheLastSuperman]

Try adding in this css to additional.css:

/* 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;
	clear: both;
}

.postbit_reputation {
	float:none;
	text-align:center;
}

.postbitlegacy .imlinks  {
	float:none;
	text-align:center;
}

.postbitlegacy .after_content {
	clear:right !important;
}

The very top snippet was provided to me by Lynne many many many moons (years ago) so credit to her as she did it first .