Hey, I had black hair and then I bleached it with Garnier extra bleach. I used to 2 box's because I have thick and long hair.But unfortunitly only my roots are blonde and the rest of my hair is dark orange.Should I buy another box and see if it works and then wait a couple days to dye it to a light brown that I want? Or bleach it again and it don't work and just go back to dark brown? PLease help ! I hate that I decided to go to blonde from black cause it looks UGLY

You really should seek a professional consultation. Trying to fix a botched bleach job is a recipe for damaged hair and possibly a chemically burned scalp. I would never recommend bleaching hair at home, but now that you have, you really need a pro to fix it.

I think you should bleach only the orange part to get it a little lighter then get hair treatment so it will get better but wait at least a week to bleach it again then buy the lit brown and wait at least 1 to 2 weeks to dye it again because if you try to dye it light brown while its orange the brown will be like a nasty brownish oringe color... :)