How can i setup than only logged users can se this option?

@insha

<?php
  if(osc_is_web_user_logged_in()) {
    ... button code
  }
?>


If i insert like this i get blank page :

<?php
  if(osc_is_web_user_logged_in()) {
<?php if(function_exists('sp_buttons')) { echo sp_buttons( osc_item_id() ); } ?>
  }
?>

I figured out

<?php
  if(osc_is_web_user_logged_in()) {
    echo sp_buttons( osc_item_id() );
  }
?>

Is there a option that user that post ad only can promote their ads?

@insha
In your if statement change from:
( osc_is_web_user_logged_in() )
to:
( osc_is_web_user_logged_in() && osc_item_user_id() == osc_logged_user_id() )

It works, i slowly start to figure how this works. You should make tutorials how to make plugin

@insha
Well, code I have posted has nothing to do with plugin, it is just customization in osclass
Anyway, this is reason why we provide support via forum, because now everyone can see how to do some tricks with buttons now.