Put wrong keys in some giveaways, how to edit ?

That's unfortunate. I guess your only options then are to delete and recreate them or just wait until they end and remember to change the keys before sending them to the winners. Deleting them will happen instantly if they are still running and won't require support to approve it. You will lose 1 giveaway slot for each deleted, but that shouldn't be an issue because you gain 1 slot for every 3 sent.

I personally would just wait until they end and then change the keys, but it's up to you.