Use the Linked Accounts Wizard

In the Home window on the Setup menu, choose Wizards, and then Linked Accounts. Follow the instructions provided in the wizard to add, change or remove linked accounts for:

Note: To edit one linked account at a time, in the Home window on the Setup menu, select Settings. Open the module the linked account is associated with (General, Vendors & Purchases, Customers & Sales, Payroll, or Inventory and Service Items), Linked Accounts, and then change the account.