You dont have to panic, take your time. What you will need to do is edit it and then open the image window, hit the cross near each picture you dont want. Then click edit at the bottom, it will most likely warn you that there are images in the thread you are not using, just ignore the warning.
Its ok we all make mistakes, and there isnt really anywhere that says all this stuff so people can know, but its just unfair to people answering the bounty if they have only one of the patterns, cause the 100gc cannot be split and can only be awarded once.