Unfollowing means unsubscription

“Unfollow non-mutual” means you would unfollow only those users who do not follow your account.

To fulfill the task you need to select at least one of your accounts.

"Delay between actions" makes intervals between subscriptions. The bigger interval – the better. To minimize the risk of blocking the account, use interval between 0 and 9 seconds.

“Number of unfollowings” specifies the number of users you want to unfollow.

“List of exceptions” specifies the accounts you will not unfollow anyway. These accounts are listed in column, in the format “username”