From the Object Types main window, select the object type whose attribute you want to edit in the navigation pane.
Click the Attributes tab in the content pane.
Select the attribute you want to edit in the Attributes list.
Click the 
button in the content pane. The Edit Attribute or Edit Attribute Block dialog box appears, depending on what type of attribute you selected.
Make changes in the dialog box as necessary.
If you want the dialog box to remain open, select the Keep Open check box.
Click OK to commit the changes.