building a chart to display time periods

Hello all,

I need help making a chart to display a time period. I already have it mostly done but I seem to have to sticking points. One is I can't seem to adjust my time on the axis to be 6:00am to 12:00am. Two, my bar graph is not displaying right. To better illustrate I included the program with better instructions next to the problem area. Thank you for taking the time to look at it.