1. To do so, first choose Data Extensions.
2. Then choose the data extension to edit.
3. To edit the name or external key for the data extension, click on the appropriate field and enter the new value.
4. To modify existing attributes, click .
5. To remove an attribute, click .
6. To add an attribute to a data extension, click on Create Attribute button.
7. After you make all the changes you wish to implement, click on Save.