You can cancel this recurring payment via the Paypal website.

1. Log-on to http://www.paypal.com

2. Click 'Profile' in the top right

-- Using the new profile scheme --

3. Click 'My Money' on the left hand pane.

4. Click 'My pre-approved payments'5. Find the relevant payments & click 'Cancel'.

--Using the old profile scheme --

3. Click 'My pre-approved payments'

4. Select the relevant payment & click 'Cancel'.
This should cancel the recurring payment and allow you to pay manually.