Click on Create Campaign to access this page below, where you will be able to add a name for the campaign and select the company you are going to advertise:
Then, just click on the yellow Create Campaign button at the bottom of the page.
In order to activate or deactivate a campaign, you can quickly check or uncheck the related box. Please note that deactivating a running campaign will result in all the contained line items immediately stopping delivery.
You would have to click on the three dots on the right and then select edit, to start editing the campaign’s details: