I'm confused about where I'm supposed to insert the 5.00% mentioned below
You are unable to input the data because the line items have a subsidiary view. If you open that subsidiary view you can see the calculations happening based on the dimension applied to the particular line item and brings the value to the normal view and the values it bought are like summaries even though it has no formula in it.
Try to match the dimensions of the line item with the module. It will help you to input the data.