I also selected rural weightage by mistake despite me living in urban area . I had read the answer but want to confirm that did it work ??

Hi UPSEE authorities have clarified about this. They have said that students not wishing to take rural weightage or dont have certificates can upload a hand written note with their signature that they wish to withdraw from rural weightage or tuition fee waiver and be considered under general category. So now I would advise you to write a note stating this and upload the same. 

sorry you can not change this you must have to ask tis to someone then fill thai but there is no option for this to change. All the best have a great future ahead.