In the answer to the faq about adding more messages to an an existing
disposable address, it says to go to advanced mode and click the view/edit
link. But I don't see any such link on the advanced mode page.
It appears that the faq should say "clicking 'search addresses' without
any address" since I tried that and it seemed to get me to the right
page. I'm new here but I'd guess the link was changed at one point
and faq was never updated.