Woocommerce SUBRE Subscription edit renewal quantity

Hi,

I am trying to edit a SUBRE subscription renewal after the order is completed. I went into the Woocommerce order tab and changed the order to pending payment and edited the quantity then updated. But under the SUBRE Subscription it is still set to the old quantity and theres no edit renewal button available to change the subscription.

Just tells me to change order to pending payment but nothing changes.

Thanks
Tim