you'll need a minor template edit for that :-
Go to Style Manager->Your style->Postbit Templates->
postbit/postbit_legacy (whichever you use)
Find:-
Code:
$vbphrase[posts]: $post[posts]
Delete it OR comment it in case you'd want it back
Code:
<!-- $vbphrase[posts]: $post[posts] -->
For profile, I don't think there's a need to do it here. Still, if you want it !!
Go to Memberinfo Templates->
memberinfo_block_statistics
Find:-
Code:
<li><span class="shade">$vbphrase[total_posts]:</span> $prepared[posts]</li>
Delete it OR comment it