Principle applicant, petitioner in L-2 visa?

[Asalot]

Hello.
I try to make appointment in the US embassy, and I stuck.
I am applying for visa L2.
What should I fill in :
Principle Applicant's Name: *
Principle Applicant's Visa Class: *

PETITIONER
Petitioner's Name: *
Start Date: *
Receipt Number: *
Expiration Date:*

Thank you

[Libra_14]

Hello.
I try to make appointment in the US embassy, and I stuck.
I am applying for visa L2.
What should I fill in :
Principle Applicant's Name: NAME OF THE L1 HOLDER (SPOUSE)
Principle Applicant's Visa Class: * L1

PETITIONER
Petitioner's Name: NAME OF L1's Company
Start Date: L1 PETITION START DATE
Receipt Number: L1 PETITION NUMBER
Expiration Date: L1 PETITION END DATE

Thank you