Account settings are listed at the top of the info/control area.

User: the name by which you are known to the hosting system. It's the same as your control panel login.
FTP Login: the login name you use when you upload your site to your home directory on the server.
Plan: the arrangement of resources and services you are subscribed to. To change your plan, click the icon next to the plan name. You cannot change between incompatible plans, like Unix and Windows.
Billing period: the period of time you pay for. Your payments include recurrent fees charged at the beginning of the billing period and usage fees charged at the end of the billing period. For more information see the Paying for Hosting chapter of this manual. Click the icon to switch to a different billing period.
Domains: the sites you host in this account. Within one account, you can host as many sites as your plan allows.

This is the total amount of information transferred to and from your account by Internet visitors and yourself from the beginning of the current billing month.
Example: If your billing period is 2 months long and started on the 5th of October, the first billing month will end on the 5th of November, and your total traffic will be reset. However, if you change your total traffic limit, your traffic will be reset and a new billing month will start.

If you expect to run up more traffic than comes with your plan, it's a good idea to raise your traffic limit.

This is the disk space you are actively using out of the disk space allocated to your account. There should always be several megabytes of slack (unused space) to ensure correct performance of statistics reporting utilities, such as Webalizer or Modlogan.

Resource meter shows how much of your resources you have used, how much you have free, and how much you can have at most in this account:

Domains - number of domains in this account
Subdomains - total number of subdomains in all domains of this account
Mailboxes - total number of mailboxes in all domains and subdomains of this account
Auto responders - total number of autoresponders in all mailboxes of this account
MySQL database - total number of MySQL databases in this account
PgSQL database - total number of PGSQL databases in this account