Hi My children don't have a SSNs. We lived in the US for a year, when I and my wife worked there, and we moved back to our home country...

[lucianothome]

shall I delete my children as dependents?

[Critter-3]

If they have no SS# or ITIN  and you are not applying for either when filing the return   then you cannot claim the children  ... delete them in the MY INFO section. 

[xmasbaby0]

If the children do not have Social Security numbers or ITIN's then you cannot claim them as dependents.  Another thing---you do not mention your own immigration status.  There is a chance you should not be using TurboTax, so you need to determine that before you proceed further with filing a tax return.

NON RESIDENT ALIEN 

If you are a non-resident alien, your return must be filed on Form 1040NR, which cannot be prepared using TurboTax.  You can use TT’s partner, sprintax:

https://www.sprintax.com/non-resident-alien-tax-1040nr-turbotax.html