Your accounts are all listed under the Accounts tab of the budget. Here you can view the current balance of each account (and easily update it by clicking on the pencil next to the balance) and add accounts.

Account View

Clicking on an account will take you to a view where you can see all transactions that you have entered for that account. Clicking on the pencil next to the account name will allow you to edit the account name, type, rate of return (for investment accounts), interest rate (for debt), your monthly contribution (for investment accounts), your minimum monthly payment (for debt), and whether or not the account should be included in your budget.