Untitled

function doGet(e) {
var currentUser = Session.getActiveUser().getEmail();
var user = currentUser.substring(5, 8);
var name = 'storemgr' + user;
var pass = 'storemgr' + user;
Logger.log(user);
Logger.log(name);
var template = HtmlService.createTemplateFromFile('Index');
  return template.evaluate()
  .setTitle('VENDORNETLOGIN')
  .setSandboxMode(HtmlService.SandboxMode.IFRAME);
}

<html>
<form id="Logon" method="post" action="https://1234.NET">
<input type="hidden" name="UserName" maxlength="30" size="30" value=""><br>
<input type="hidden" name="Pwd" maxlength="200" size="30" value=""><br>
<input type="submit" value="ASSOCIATE VERIFIED - CLICK FOR AUTO-LOG IN">
</form>
</html>