If you want to revoke MrQ's authorisation to your PayPal account, simply log in to the PayPal account associated with your MrQ account and follow the steps below:
Choose the 'payments' tab along the top
Click 'View' next to 'Manage your pre-approved payments'
Select 'Lindar Media Limited' from the list on the left hand side
Click the 'Cancel' button next to the active status to revoke authorisation
Now that this pre-approved payment has been cancelled, you will not be able to make deposits on MrQ using your PayPal until you re-authorise payments.