To Add/Change a memo amount (an employer paid benefit, ie 401k Match, Employer paid health insurance, HSA etc) use the following steps below
After logging in please select the Employees tab on the top ribbon
Select the appropriate employee from the active employee list
Navigate to the Payroll Info tab (below). You can chose the "+" to add a new memo item, the pencil icon to make a change to an existing memo, or the trash can to delete it.