Hi Lok,
add this code to your css and disable 'Include bootstrap CSS' from configuration (see screenshot)
ul#profile_tabs{list-style:none;margin:0;padding:0;height:35px;position:relative;border-bottom:4px solid #1782C7;}
ul#profile_tabs li{list-style:none;margin:0;padding:5px 10px;float:left;}
ul#profile_tabs li a{font-weight:normal;color:black;font-family: "NovecentowideNormal",Helvetica,Arial,sans-serif;font-size:12px;}
ul#profile_tabs li.active{border:1px solid #1782C7;background:url(/templates/rt_diametric/images/overlays/light/nav-lines.png);;border-bottom:0px;border-top-left-radius:4px;border-top-right-radius:4px;height:24px}
.tab-pane{display:none;}
.tab-pane.active{display:block;}
.chzn-container-single .chzn-single{padding: 0 0 0 8px !important;}