enlarging a photo

we first chose witch negitive to develop then we made sure it didnt have water drops on it then we cleaned it if it did. we dipped it in foto flow cleaner for 15 seconds then dried it with special towel. then we put it in the machine and focus and enlarge it then we got a test strip and we exposed the paper in segments so some got more light than others so we could find how many seconds was perfect then we do it again for the right amount of seconds directly on the paper