The “Customize My Profile” button doesn’t provide link(s) to edit any of my information, regardless of browser used. Zip. Nada. The only link in the lower right main section is “this page” under “Contact”.
I tried that (with myself as user). Since I’m a moderator, what I see might be different.
And what I see are some text fields for tweaking things like colors. I have no idea what to enter in them, so I backed out of that page.
At the top of forum pages (top right), there should be a link for “Settings”. That’s where I go to change things. On that settings page, there’s an “Edit profile”. That’s probably what you are looking for.
Apparently I never managed to get the mouse pointer over one of those itty bitty link targets long enough to present as a link. Their existence as edit links could use substantial improvement. Those “pencils” look like those useless flag icons on browser tabs and the bookmarks toolbar back in the early development of tabbed browsing. http://fm.no-ip.com/SS/Moz/Moz-TWRRSup1.png
Need for improvement also goes for the icons surrounding this textarea. Without the tooltips on hover I’d be unable to determine what most are for.