Wrong fb account connected - how to delete from Shopify before continuing?

[GenevievePool]

Hiya guys! How do I delete this wrong account? I tried to get onto the right one for my client, but FB is being a $&^$^#^&@& and won't connect anymore. She has a business account for her store but we can't connect it, and this is my private account. It's been really frustrating for us the past days haha

Thanks!