Forwarding?
 

When I change forwarding address the old forwarding address had been disabled but it stays displayed. The new forwarding works but i would like to remove the old address. How can i do this? I have tried deleting new address and re installing it but oldie is reinstalled above new one and still displays the " disabled" on it

Where are you making the change? Can you provide a screenshot?

If you are using the normal forward section click forward and then you can backspace (edit) the email address in that email
But it sounds like you are forwarding with sieve.

Thank you Terry I will try your suggestion