To edit the condition, select your conditinal text and click the Conditional Text button  on the D2HML Styles toolbar. You can make any changes in the Condition dialog box.

You can also edit the D2HML properties. If the D2HML properties are specified using the D2HML attribute, edit the platform, target or attribute properties in the attribute.

If the D2HML properties are specified in the text, edit the platform, target or attribute properties which are visible in the source document.

For more information, see Using the D2HML Attribute in HTML Source Documents.