MS Excel Problem

Simplest way is to highlight the area of cells you wish to work on, right click, select "format cells" , click on "borders" tab then you use the big buttons with symbols of either outside / inside / both, top/ bottom/ left/ right..then choose the line style, and select the colour from the palate, You can also use the "shading" tab to create interesting effects, as well as the "fonts" tab. you will learn more by experimenting...enjoy !