I efiled but left out a gambling form.

[null57]

I already filed but didn't enter a form on gambling winnings (but amount was reported). What do I do?

[KrisD]

All you can do is file an amended return. You should allow the original to be processed first, but make sure you pay any tax due today to avoid any additional interest. 

https://ttlc.intuit.com/replies/3288565