Campaigns would be called Feedback Rules in eDesk.
You can easily create new ones when clicking on the Feedback section on the black top bar, you can then select Feedback Rules on the left-hand side of the screen:
Once this has been done, you can then select Add Feedback Rule on the right-hand side and this will allow you to start creating rules for all your marketplaces.
Setting up new rules is pretty straightforward but if you have any further questions don't hesitate to reach out to our Support Team!
This video will show you to do this in greater detail: