How to modify excess HSA contribution information.

I had excess contributions to my HSA because I enrolled in Medicare Part A.  I backed it out and received my 1099-SA but see no way in TurboTax to enter the gross distributions, earnings on excess contributions, and Distribution code (=2), even though the instructions says  "Here is what we have for you, but you can change the information".  Please tell me how that can be done. Thanks