"Other" Expenses (that appears in the Right Side Summary column) are auto-calculated based on two sets of Costs...
1) Your Product Cost, that you setup in the Product Manager by clicking the "gear" icon as shown here:
Then, adding your Product Cost ($) as shown here:
2) Individual Expenses that you added in the Expense Manager by clicking the "gear" icon as shown here:
Then, adding your Expense item amount ($) as shown here: