Deborah,
Choose View - Master - slide master.
Select the object area by clicking on the edge of the box.
Choose Format Bullets and numbering and select the bullet you want. There is
a list that allows you to adjust the size of the bullet and the colour.
Click OK and your done.
The bullet you have chosen will be applied to all five levels. If you do not
want that you will have to select each level individually and format
accordingly.
Hope this helps
Luc