How to connect your Facebook account
Step 1: Click on Connections in your dashboard
Step 2: Click on Connect next to the Facebook logo
This will automatically connect your Instagram account as well.
PS: You can also upload a video first and connect your apps from within the canvas.
Any app that isn't connected yet will be grayed out on the right-hand side. When you click on it, you can connect it and go through the same steps as shown below:
Step 3: Click the "Continue as..." button in the next screen
That's it, you're done!
Your Facebook and Instagram accounts are now connected and you can start publishing.