How do you connect your Instagram to your Facebook?

[Sophia]

Ok, so I let my little sister use my phone for her Instagram and Facebook. So when I am not logged in to either of them, she is. I logged into both my Facebook and Instagram and tried connecting them but it connected my Instagram to HER Facebook so whenever I like something or post a picture, it will post on her Facebook wall but on my Instagram and won't post anything on MY Facebook page. How do I fix this??

[A lady with class]

*check your settings.

*undo the link she made with your account