Where can I find my account information?

Where can I see my account information, i.e. contact info, payment type, plan options, everything related to my account.

Your account type, username, registered email, avatar, etc. are all located on your Account's Profile page.

From that same page, there are menus on the left that will let you navigate to different sections on your account.

e.g. if you want to see your billing details, go to your Account's Billing page (labeled Billing on the left menu)