registration form still accessible, tried solutions but still does not work

I have successfully created and linked a gform with the registration add-on, a user is created, and all the data from the fields are collected.

The problem I have is that after the user logins to the site, the form still shows to the user. It should only appear for visitors.

I tried the solution from this post: http://www.gravityhelp.com/forums/topic/registration-form-still-accessible-to-logged-in-users

When I try to access the registration form after I log in to the site, it successfully redirects me to a designated URL I chose to. The problem I have now is that the form disappeared if a user is not logged in ( visitors).

This is the message that shows up in the page "Oops! We could not locate your form."

Help please!

This is the form: http://www.portadallc.com/signup/

When i added to code from Dana, the form does not show when the user is logged in, and redirects to another page. The problem is that if the user is not logged in, the registration form does not show up. That mean that anyone who wants to register won't be able to do it.

I removed the restriction. Please try again.

Notice that the form is visible at the moment, I removed the code from Dana in functions.php

This is the code I added in the functions page (where the id # is the one for my form):

//add the pre_render filter for form id = 5
add_action("gform_pre_render_5", "redirect_logged_in_user");
function redirect_logged_in_user()
{
    if (is_user_logged_in())
    {
        echo '<script language="javascript">location.href="http://www.portadallc.com"</script>';
    }
}

I added the function again, so that you can check what error shows.

Sign Up
Oops! We could not locate your form.