Why did it reject? If it was for the AGI that is not needed now. AGI is only to efile. Efiling is closed so you have to print and mail it now. But if you need to fix something, yes you have to use the Desktop program.
How to finish a prior year online return https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
