To edit your ads go to “Ads view” and select the ad or ads you wish to edit. When you select an ad the bottom toolbar will be visible. In the bottom toolbar you can edit your bid and tracking options.
If you want to edit the ad creative or the targeting you need to edit your templates in the Create Ads tab or in the Set Targeting tab and republish your ads to Facebook.
If you're using the 'Lowest cost with cap' bidding optimization, you can edit the bid from this section. You can also increase the bid by a certain percentage or value if desired.
Facebook pixel tracking
In the Tracking tab you will be able to change or add the Facebook pixel. If you use view tag tracking you can also append your tags in this tab.