If you are unable to configure your account and you get the following error
"Sorry, you must accept all the required permissions in Facebook"
You need to return to the first step of creating your account with Brainity to when it asks you to log in with your Facebook account.
Login again and this time and Facebook should ask you to grant permission to the app so it can run your ads.
Make sure that you select that you accept all the terms so that you can move on to the next section (indicated by an arrow below).
Following the above steps should resolve the issue. If not, contact support.