Deductions & credits

I filed my 2018 taxes on-line, so I seem to have the desktop version of TurboTax. I can get into my 2018 return to amend it, but I cannot enter any new figures. I am cycled between ‘update’ and ‘continue’. 
I have been a TurboTax customer for years. This is the first time I have requested any help for TurboTax. Unless someone actually steps into offer me some assistance, I guess I will give up on trying to amend any tax returns.