It is a gift link. It will be sent on email once you see the "key" revealed on your Won page.

If you don't see the email, check your spam folder before writing an "I don't see any email" message here.

I know you'd think this would be the logical thing to do before complaining, but the past two weeks has showed me that at least 10% of the user base lacks this minimum degree of intelligence to do this without explicitly being told to do so.