At the top right corner of the screen click on the tool icon and choose the Property Settings / Financial Settings / Currencies & Accounts:

In the bottom of the window, you will see the list of Accounts and Payment Methods.

To add a new account, click on the Add Account button on the right.

You will see the Edit Account window:

1) Place the name of the account.

2) Choose which staff role will be able to view the transactions of this account.
Read here: Setting up Roles & Permissions

A) Determine if the account is active or not
B) Choose the method of payment that corresponds to each account *
C) Check this option in case you want this account to be counted during shift switch.

* In case you want to have more than one account with the same method of payment you can choose it after saving the account.