Navigate to the relevant Adset(s) by clicking on the Campaign name then select the ones you want to adjust by using the check boxes on the left hand side of the table. You will see 'Edit Bid' and 'Edit Budget' become available, click the attribute you wish to adjust.
For both editing bids and budgets you will be presented with two options:
- Edit all ad sets at once OR
- Edit each ad set individually
When editing all ad sets at once, you simple place your new bid/budget in the box on the left and click Apply. If you wish just to tweak the bids/budgets of individual campaigns, adjust them on the right hand side and click save.