... the page you linked will automatically update to display a form which gives you the option of turning Copper Membership on or off.
That's all you need...
Once you have it, you get the choice:
First of all, hope my question goes in this board.. if not, please move it to the right place , let me know, and sorry for the inconveniences.
I would say you have posted the topic where it belonged too. Don't worry.