US Immigration from Morocco

Our K1 was approved today. The paper my fiance was given states "... please visit the Amarex office you selected to pick up your visa. Please ensure you registered at: www.ustraveldocs.com". I'm fairly certain we are not registered and I don't see where I can do this on the website. How do we register?

Please, anyone here can help us. I and my fiance want to put Her dad as a sponsor for me on form I-134 for a k1 visa.

my question is:

Is there special information that we need to care about them?
WHERE DOES HIS INFORMATION GO?
WHAT INFORMATION IS INCLUDED IN THIS?
HOW CAN WE INCLUDE THIS INFORMATION?
WHAT AM I TALKING TO IN THE INTERVIEW?

what we can do in this case exactly?

Thank you so much,

Please I need help. When I enter the login information on the DS-260 form, the system takes me to the next page but when I press ''OK'' the system is not responding, Returns me to the first page again, that on the Mozilla browser. but the Microsoft Edge or Google Chrome doesn't respond at all. The system says

Sign In Failed

The characters you entered did not match the characters displayed in the box. Please try again. ( I am sure I will not do the same mistake more than 3 more )

Is there a possibility their system does not work well or I am who is doing something wrong. Please if there any information you can help me with. Thanks

Hi Friends! Please, if anyone can help me and my fiance to fill I-134 form. Thank you so much I would really appreciate it.

For ''in care of name'' who should be named in it Supporter ( petitioner) or supported ( immigrant )

Do you get an assigned USCIS number when you apply for or receive a K1 visa?