The key point of any optimization is rearranging your money flow from non-profitable to profitable placements. You can set a custom bid for any target / source in your campaign.
 

Setting a custom bid on a given source or target will allow you to:

  • Receive more traffic from the source / target, if you raise the bid
  • Lower the price of traffic from the source / target, if you lower the bid

 
Hence, you have three options of source level optimization :

  • If you have great ROI on traffic from a given source, increase your bid to get more traffic.
  • If your ROI on traffic from a given source is marginally negative, lower the bid to pay less.
  • If a given placement does not perform at all, just pause it.

 

Modifying the Bid
 

In order to set a custom value for the bid, perform the following steps:
 

  1. Go to the Targets / Sources tab.
  2. Click the Auto button in the Your bid column. The cell switches to the editing mode.
  3.  

     

  4. Provide a custom bid for:
    • A target: It will override both, source and campaign bids.
    • A source: It will override the default campaign bid.