[pypy-dev] Access denied when trying to create a pull request

Hi, I have a recently published work about PyPy and want to create a pull request to update the documentation ( http://doc.pypy.org/en/latest/extradoc.html#papers). But I got an access denied page when trying to do so. How to create the pull request for the PyPy project? Or can anyone help me updating the documentation? Thanks! Yangguang