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You have to use two separate <form>s - one for the index page 
arguments, and the other for editing. 
 
Note the last two lines of the first step in the instructions from 
the manual: 
 
1. add a form around the listing table, so at the top it reads:: 
 
    <form method="POST" tal:attributes="action 
request/classname"> 
     <table class="list"> 
 
   and at the bottom of that table:: 
 
     </table> 
    </form 
 
   making sure you match the ``</table>`` from the list table, 
not the 
   navigation table or the subsequent form table.