To make changes to your account settings, head to Settings > Account.
There you can:
See your current plan, your next billing date and how much of each limit you're using
Change your time zone
Change your name
Change the email you use to log in
Change the password you use to log in
Each section has its own "Save changes" button. Be sure to click it after you make any changes.
To upgrade your plan, manage add-ons or open the billing portal, go to Settings > Subscription. See How do I upgrade or downgrade my plan?
Time zone
Choose your time zone and click "Save changes". To use it for all your posting plans too, check "Apply this timezone to all plans" before you click "Save changes".
Name and email
Under "Account holder", change your first name, last name or email, then click "Save changes". This is the email you use to log in.
Password
Under "Change password", enter your new password twice, then your current password, and click "Save changes". Your password must:
Be 8 to 32 characters long
Include at least one lowercase letter (a-z)
Include at least one uppercase letter (A-Z)
Include at least one number or symbol
Forgot your current password? Log out, then click "Forgot your password?" on the login page.