Forms 8288 and 8288-A are not supported in TurboTax. You cannot use TurboTax to prepare those forms. They are not part of your tax return. They have to be filed separately.
You can download the IRS instructions for Form 8288 (including Form 8288-A) from the following link.
Instructions for Form 8288
This is a fairly obscure area of tax law. If you are required to file Form 8288 you may wish to seek professional help.