Using the ruler
1. Select Left Tab 
at the left end of the horizontal ruler to change it to the type of tab you want.
2. Choose one of the following types:
A Left tab stop sets the left end of the text line. As you type, the text fills toward the right.
A Center tab stop sets the position at the middle of the text line. As you type, the text centers on this position.
A Right tab stop sets the right end of the text line. As you type, the text fills toward the left.
A Decimal tab stop aligns numbers around a decimal point.
A Bar tab stop doesn't position text. It inserts a vertical bar at the tab position.