How to chnage selfreg_applyuser.jsp ?

I try to change the selfreg_applyuser.jsp so that another jsp opened after the user pressed the submit button.

I have changed the code:

    <form name="selfRegForm" method="post"
     action="newPage.jsp">

I have saved the changes and saved the file under the same name. After restart I get the message when I press submit:

<b>iView not found: newPage.jsp.</b>

Both jsp files are unter:

Server\sapmnt\Ept\Jc01\j2ee\cluster\server0\apps\sap.com\irj\servlet_jsp\irj\root\Web-inf\portal\portalapps

<b>Edit:</b>

I will open a new .JSP-File and on the same time save the user details to the SAP Portal. How can I handle this?

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SAP User