How to change the income, I do not have W2,but I still have income

What kind of income are you trying to enter?  Be specific so we can help you navigate.

I have J1 visa, original from China, therefore I am tax free in US, I work for univeristy

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