Colorbox with editing e-mail/pass

I'm trying to use colorbox to allow the user to change their e-mail and password when logged in.

I've tried some of these things...

1 <a href="/user/1/edit?width=500&height=500&iframe=true" class="colorbox-load">Link to form iframe=yes</a>

2 <a href="/user/1/edit?width=500&height=500&iframe=false" class="colorbox-load">Link to form iframe=no</a>

3 <a href="/colorbox/form/user-profile-form?width=500&height=250" class="colorbox-load">Test</a>

Ideally, I think the last one would work. I'd like someone to click a link, colorbox opens, they change user/pass, click save, and the window closes and it says "Success" on the parent page. If I was after this, I imagine the best method would be no iframe, correct (trying to think about the UX and what makes the most sense)? If I understand correctly, an iframe would show the success message on the following page after the person submits the form.

Anyone have any tips ? When I try 3, I get this error: Request unsuccessful: Forbidden (I am user 1, no idea why)

I imagine I'm missing something small but can't seem to get it. Any two cents appreciated. Been at this for hours on main install and a clean install.

Thanks!