Answer:
- Go to Settings--> Users--> All Users 
- Select the pencil icon by the user's name 
- Select the checkbox 
- Click remove 
For more information, please refer to this article http://help.woosender.com/en/articles/6719331-woosender-users

Go to Settings--> Users--> All Users
Select the pencil icon by the user's name
Select the checkbox
Click remove
For more information, please refer to this article http://help.woosender.com/en/articles/6719331-woosender-users