You can change your password under General Settings . You must key in your new password a second time to confirm that you have entered it correctly. You can also set your Privacy Setting . Various people are responsible for the administration of this part of the site. The door is always open.
Links are fine.
Your submission then ships off to the administration box where we can check it over and decide what to do with it. I have a fairly long feature I want to write. As this kind of thing is likely to take some serious time and mental energy on your part, it's probably best to e-mail us and let us know what you have in mind. This will avoid any overlap or just plain off-topic problems. The earlier you can let us know what you're up to, the better.