How do I delete past year's tax information I entered to TT Online? I ended up not using TT these years.

Last year and the year before, I entered some numbers to TT Online but I decided to use other service, and the data TT Online has are not accurate. So I would like to remove my tax year for those years I didn't use TT Online. I went to Previous Taxes section but I don't see "Delete 20xx return" kind of command.