How can I delete a Sequence that was posted before i got an account.

[Stellar_Nova]

I made a song call Twilight Waltz in another website called Beepbox and uploaded it here to test this one out. I accidentally uploaded it as a public sequence without knowing what i was doing. It's even a song that I posted the original version on YouTube as StellarStudios, but i cant find a way to delete the sequence from here. this is a bit worrying that something will happen to it. Any help given will be appreciated.