Do I need to add 1099-DIV if its less than 500$? If yes, could you share how to submit the amend returns for 2 years?
Yes ... you must report ALL income on a return so amending them will be required :
To see how to amend your taxes, click here:
Steps to amend in TurboTax
How to file amendment
Will I need to print & mail 1040x or will turbo tax e-file the amendment?
If I need to print,sign &mail - is turbo tax amend return free?
All amendments must be mailed in at this time. And as long as you can use the same online program you used to file the original return the amendment process is free.