To Edit Text in a Dimension Element

Select the Edit Text tool.
Identify the dimension text.
The Text Editor window opens. All text that is generated from the geometry of the element(s) dimensioned is represented by an asterisk (*).
Edit the dimension text.
Text placed before the asterisk precedes (and text placed after the asterisk follows) the text that is generated from the geometry of the element(s) dimensioned.
Enter a data point to apply the change.
Tip: You can delete the asterisk when editing dimension text. To restore the text that is automatically generated from the geometry of the dimensioned element, edit the dimension's text again and insert an asterisk.

Note: Text entered in the Text Editor window is not associative — it does not change when the dimension element is modified.