Good Morning @Zoe77, thanks for your post on our Community Forums, and a very warm welcome to you!
Sorry to hear of the frustration caused with our web safe features.
Can you please try accessing your self-care account with an alternative browser or clearing the cache on the browser you're using to see if that allows you to make the desired change?
Do feel free to come back to us once this has been attempted.
Kindest regards,
David_Bn