How can I delete a broken theme

Hello all,
I tried uploading a premium theme, but I got an error message. I guess parts of the theme weren’t uploaded. I tried uploading it again, but since the one I tried uploading before appears on my theme page, (the name and an error message) I’m not being allowed. My question is: How can I delete this incommplete theme? It doesn’t have a delete button like the ones that were fully uploaded.
Thanking you in advance.
jo