Unable to change medical premium amount

I need to go back and change the amount I entered under medical expenses, for the total amount of premiums I paid for the year. I have to pay back some money  as my advanced payments were to much, thus my premiums were higher.

 

When i try to go back, it will not take me to the proper screen. It always starts me at the prescription screen which is past the premium section. I have cleared the cache with no luck. Any help is appreciated.