i dont see the profile change button
i think i see the problem. as i had the same thing.
It could be that your signature is so long, it pushes out on the box, but there is no scroll bar. What you need to do is click on some box on the change profile page, and press TAB until you can't see the dotted lined around the box, then press enter. Usually, the button gets pushed off the page, so you can't click on it. This has happened before, here is a better, less-complicated instruction:
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I believe you can also just hit the "Enter" button on your keyboard. Works on my laptop, and I'm not sure if it would be set up differently on other computers. You may have to use the "Tab" button a few times, and then hit enter.