I typed the words "free postage" in to the title of my item in error but stated the postage price in the description. I didn't realise thisuntil the after the item had a bid. I'm trying to revise the listing by writing a note in the box below the description but it keeps askling me to enter a valid postage policy. I don't need to change that part. Can anyone help? Am I now obliged to provide free postage?