The upgrades support page claims there should be a cancel button/link next to each of my upgrades. But, on my My Upgrades page there are no such buttons/links.
To add to the confusion, the domains settings page helpfully suggests, “Please contact support if you wish to delete a registered domain.” When I click on the “contact support” link I arrive at a page that apologizes for only offering support to those who have purchased upgrades. Well, I have purchased upgrades, but there is no contact form for me to request a domain deletion.
Doh! I get it now. Thanks for the dope-slap, macmanx.
Just in case it helps anyone else out, I have to say that it is confusing that 2 upgrades are listed on the Store/My Upgrades page even though they were purchased by a different account, thus apparently not mine. I now see the “Purchased by” field is the clue to whose upgrades they are.