Click on the "Expense" tab on your lefthand toolbar.

Here you will find all the expenses that are associated with the proposal. Typically these expenses are set by the region and firm but to request an adjustment on these fees you would click "Request Charge Override" and in the notes section you would add what you're looking to have changed.

You also have the ability to add additional expenses by scrolling down to Additional Expense and clicking "+New". Here you can use the dropdown to fill in expense type and fill in the Amount as needed. Please make sure to add clear notes to the description box on what the expense is for.