[n_only]

you can do that by :
Admin CP | Advertising | Manage Ads => Thread

1. 
   
   • Choice of inside first post or second post or both.
   
   
2. Admin CP | Styles & Templates | Edit Templates =>
   
   • test ad_showthread_firstpost_start
   • test ad_thread_first_post_content
   • test ad_showthread_firstpost_sig

OR .. by manual editting your postbit_legacy :


And search for the code

PHP Code:

<vb:if condition="$show['attachments']"> 


And add below it

PHP Code:

<div align="left">
but here you image, or html code
</ div>