US Immigration from Bolivia

I received an email from NVC about upcoming interview appointment for my wife and step-daughter. It directs me to this site -> Interview Preparation (state.gov) I click on the link go to embassy La Paz. It says to register appointment online. I attempt to register both but when I enter their Case No it says not ready for appointment. Do I have to wait to do this? Also, it ask for the DS-260 number. Is that the Confirmation No on the DS-260?

Finally got document approval from NVC. I am reviewing info from the embassy. Says an MVC fee will need to be paid. $265 for wife. Don't know for step-child. Does this apply?

I know the biometrics fee needs to be paid and don't know how much that is.

Wondering when all the fees stop!

Looking for information.

USCIS approved. Completed NVC portion (Submitting documents) on Sept 13, 23. I read that NVC sends to Embassy and Embassy in LA Paz will set up interview about 4 weeks after receipt from NVC.

I am guessing that NVC is sending documents I uploaded? Correct?

Are they sending by email?

Any idea how long after NVC process to get the interview?

Thx

I got to the end of the application. I click on sign and submit application. It doesn't go to confirmation page. Nor does it give me an error.

Any idea?

Which I864 do I fill out? I864EZ or I864? USCIS had approved both of them. I am working on my affidavit of support (AOS).

Thanks