i-90 application to get GC corrected

[r_a_2007]

I am applying form I-90 as gender on my GC is incorrect

1. Can I apply online since I am applying as DHS error and so no fees need to be paid ?

2. i-90 has a field on part 3 of the form field 1. Location where you applied for an immigrant visa or adjustment of status: My 495 was applied to Vermont Service Center but then case got transferred to Texas Service center. So should I write Vermont or Texas as an answer to this field ?

3. Class of admission on I-90 is the same as category on green card?

4. Date of admission on I-90 is same as green card start date?

Answer to question 2 is very important to me , rest of the questions I am just looking for validation of my understanding as I am applying I-90 myself.

Thanks in advance.