No, you do not have to mail the tax return. First go to the Apt number space and use the 'delete' key, then follow the instructions next.
In this situation, first please try clearing the cookies and cache. It handles many issues that seem nonsensical on a regular basis.
- Close your TurboTax return first.
Watch to be sure you are selecting 'all time' as example. Do not use selections like 'last hour' for those browsers that give you options.
Once this is complete open your return and see if you are able to complete the filing process.