How to show ads in first post at the end of message?

[ShawneyJ]

once only...under $ad_location[ad_showthread_firstpost_sig]. if you do not have that then under $template_hook[postbit_signature_start].

Long as your code is directly above: <if condition="$post['signature']">

Postbit legacy Example:
$template_hook[postbit_signature_start]
$ad_location[ad_showthread_firstpost_sig]

YOUR CODE

<if condition="$post['signature']">