How do we set up auto-renewal for payment of signals so we don't
have to go in the back office and do it manually every month?
I believe just make sure you have the money in your MQL5 Account.
Transfer over enough to pay for multiple months
Go to Signals page, then My Subscriptions on the left and under the signal you are subscribed to, click on the settings wheel and choose auto renewal.
How do you turn off auto renewal please?
This is in preparation to move to a different signal.
Go to the settings wheel in Signals >> My Subscriptions in this website and click on Auto Renewal, then it will turn-off (if it was on).