Select the exchanges that you wish to buy media through. These are inventory sources that your ad will run through (also known as supply side platforms). You can select as many or as few exchanges as you would like, but as a starting point, we recommend you run on ALL exchanges, so you have access to the most inventory. To target an exchange, click the green plus button next to the name of the exchange in the list on the left-hand side. This will add this exchange to the campaign. To remove an exchange, click the red minus button next to the name of the exchange in the list on the right-hand side.
See the full list of available exchanges here: Exchanges