It's super confusing, but if you setup your instagram account as a business account, you'll be able to run ads within the Business.Facebook.Com thing.
It's really quite annoying, but this will help you get started.
Here's how to convert your Instagram to a business account.
This must be done on your phone, you can't do it in a browser on your computer.
2 - Hit Your Profile Photo in Lower Right, then Menu on the Top
Now, fill out the information it asks you when you move out, and then what you'll do is go to business.facebook.com, head to the business settings, go to