Go to Marketing Activities.
Select your Email and then click Edit Draft.
In this example we're making the Subject Line dynamic. Click in the Subject field, then click the Make Dynamic button.
Enter the Segmentation name, select it, and click Save.
Your segmentation and its segments appear under the Dynamic tab on the right.
Apply Dynamic Content
Click your segments and add your subject line.
Repeat for each segment.
Create a default email before applying content to the various segments.
Changes to Default segment content block gets applied to all segments.
Sweet! Now you can send flexible emails to your target audience.