Dear employer,
I have been an HTML + PHP + MYSQL developer for over four years, and have gained significant knowledge in the subject matter. I've worked with various different secured, back-end pages that are only available to those who logged in. From the sound of your project description, this should be a fairly easy job as the website already exists. Thank you very much for your time, I look forward to hearing from you.
Sincerely,
Kylorcache