Llena el cheque y lo firma con su nombre y apellidos.

Correct way to say it:
Llena el cheque y lo firmas con su nombre y apellidos.

Translation: Fill the check and sign it with your name and surnames.

This question is involved in your daily activity sooo im sorry i cant

1. incorrect, it's supposed to be me los das 2. correct3.incorrect, the "s" in las isn't supposed to be there because you want to know one answer not multiple