N.J. Stat. Ann. § 19:58-21

Any voter shall be entitled to mark any Presidential ballot, so forwarded to him, for voting at any election by indicating his choice of candidates for the offices named. When so marked, such ballot shall be placed in said inner envelope, which shall then be sealed, and the voter shall then fill in the form of certificate attached to said inner envelope, at the end of which he shall sign and print his name in his own handwriting. The inner envelope with the certificate shall then be placed in said outer envelope, which shall then be sealed.