Step 1: Go to My Plan > Expenses

Step 2: Open the Medicare Expenses (65 through longevity) section

Step 3: Enable the Estimator (if not already enabled)

Step 4: Press ✎ (pencil) to edit your Medicare selection

Step 5: Press on "Add employer sponsored Medicare coverage +"

Step 6: Enter your annual out-of-pocket costs and the age these costs will end

Step 7: Press Next

Step 8: Make sure to press Save