There is one action I found surprisingly hard to do…
… find the button to pay you!
I have a free account, and was I looking all over the interface for the “upgrade to premium” form… it took me too long to find the right menu under the tiny settings cog.
The most obvious places, from my perspective:
* the text that says “FREE STANDARD ACCOUNT” should be a link.
* there should be a link in the About page.