Once you have a Facebook Inventory Ad campaign running, you can change your budget, pause campaigns, and restart them anytime.
To get started, first go to https://business.facebook.com.
When landing there, the homepage should show you the below:
From here we can navigate into the two most used items Page and Ad Account.
Clicking into the Ad Account will bring us to the Ads Manager. Click the name of the ad account to go into it.
This will open a new tab, with the Ads Manager showing:
From this page we can Turn the campaign on/off. To the left of the campaign name is the toggle button to do so.
To the right of the Campaign name, should be a column for Budget, this is a daily budget and can be adjusted by clicking on the pencil while the courser is over the budget.
If you have any questions or issues, we are always glad to help. Just let us know.