I am hoping this is an easy question:

I am invoking an "action" when a visualforce web page is loaded.

    <apex:page contentType="text/xml" controller="MyPageController" action="{!MyUpsertAction}" showHeader="false">

From extensive tracing and debugging, I know MyPageController is working and MyUpsertAction is working
up until the moment it tries to do an "upsert".

I can't figure out how to allow DML operations initiated through a web/visualforce page.

I get the dreaded "Authorization Required" page displayed (instead of the XML my page should be serving up).

I also get an error message sent by email.

    Apex script unhandled exception by user/organization: 005A0000000IePu/00DA0000000Jcjx

    Visualforce Page: /

    caused by: System.Exception: DML currently not allowed


I am sure there is a quick fix by clicking some option somewhere on Saleseforce,
but I am really pulling my hair out trying to find it!

Please be specific about the steps I need to follow to solve this problem.

I am new to developing on Salesforce, so if you just say "enable DML for the site",

I won't have a clue where to navigate and click on the Salesforce web pages.

Any suggestions would be appreciated.

David Jones

dxjones@gmail.com