On this help page:https://support.google.com/plus/answer/2676340?hl=en#
"Change capitalization or accents of your custom URL"
"If you want to change the capitalization or accents/diacritics of your custom URL, follow these steps:
Go to the "Links" section of your Google+ Profile or Page.
A box will appear allowing you to make edits to the formatting."
The "box will appear allowing you to make edits to the formatting." is missing. Any ideas?