Delete Giveaway

Go to the giveaway page and on the left side the lowest option is "delete giveaway".

A good start is to give the FAQ a look and also the guidelines.

You should try to hurry to delete your giveaway: before the giveaway ends, GA deletion is granted automatically, after the GA ends, you need approval from the winner and to create a ticket.
In both cases you lose a GA slot, so make sure it doesn't happen to often or you might run out (slots resplenish as you successfully create and fulfill GAs)

Cool, das Problem scheint gelöst :)
zur Information - was immer du auf Deinem Steam-Account aktivierst bleibt in Deiner Library, für immer!

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mit besten Grüssen !