I have just dyed my hair black it was dyed blonde but I don't like it black and would like to go blonde again can you give me some tips on how to do this.

How long has it been since you dyed it black? If you color your hair too often you're going to damage it badly. Lightening hair is much more difficult than darkening. You probably have to strip it completely and then add back the color that you want. Personally, I wouldn't mess with it. Go see a professional.