add button to datatable row dynamically

Call the fnCreatedRow function, which fires after every row is created (callback). Call your method from there to do what is needed. In this case:

   $('#users_table').dataTable( {
       "fnCreatedRow": function( nRow, aData, iDataIndex ) {
           $('td:eq(0)', nRow).append("<div class='col1d'><button class='editBut'><img >src='img/property32.png'></button></div>");
       },
   });