User Activity

I have had four people cancal sales on me in the last week,Twice it was because they didnt want to travel to pickup the item.The other two times it was because they had some family drama? UHUH.Anyway I was wondering if this was just happening to me?I...
can someone inform what i do if someone pulls out of a sale?
Can someone please tell me how to set a reserve on my item, it says to have a reserve to click the option when I do it though it does nothing?