1.Login to your blogger dashboard and go to Layout --> Page Elements.

2.Click on 'Add a Gadget' on the sidebar.

3.Select 'HTML/Javascript' and add the one of code given below and click save.

<script language=javascript>
var as = 1;
function statusbar()
{
var msg  = "TYPE-YOUR-TEXT-HERE";
var msg1  = "* * * * * * * * * * * * ";
var msg2  = "                                    ";
if(as == 2 )
 as = 1;
else
 as = 2;
timer = window.setTimeout("statusbar()",100);
var sds = eval("msg"+as);
var ss = "    "+sds+"  "+msg+"  "+sds;
window.status = ss;
}
statusbar(100);
</script>

Now you are done.