Hi,
Hope you have already created a customer. You need to create an arrangement choosing the product group like Current account or Savings to create an account. Select the product from the list of product for eg: savings account,click on the new arrangement and input customer id and currency. Further if any conditions req. input them and commit & Authorize the arrangement.Once the arrangement is authorized,automatically Account will be created by the arrangement, you can see the account no in the Account tab of arrangement record.