Turbo tax me off filing my 2020 taxes, i needed to file back from 2018 now i already paid the$100 for tax and max what to do? i have to enter everything from 2018 again?

The TurboTax online editions are Only for tax year 2020.

To complete and file a 2018 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2018 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/

A 2018 tax return can only be printed and mailed, it cannot be e-filed.