You have to modify the postbit or postbit_legacy template... you can move the code to next to the username... I actually did this by mistake the other day and had to 'fix' it. Search for " $post[onlinestatus]" and move it to wherever you want it to display.
To put it next to the username put it below the following code:
Code:
<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]" $post[mh_unm_username_history]>$post[musername]</a>