Once an attribution has been assigned to a contact you can edit an attribution by selecting the contacts setting and clicking attribution.
An attribution is composed of four different data points.
To add or edit Campaigns & Channels to the drop-down list.
Delete an Attribution
You can delete an attribution by clicking delete, and then selecting an update.
Add Manual Attribution
You can also add an attribution manually by selecting Add attribution.
For more information on the contact page and attributions, you can visit the following articles.