Signatures are not needed while filing. But you have to submit all required photographs. You should electronically submit your recent photograph along with the one of your spouse and each unmarried child under 21 years of age. If you submit more than one entry, you will be disqualified regardless of who submitted the entry. You can submit your own entry, or have someone else submit the entry for you. But a husband and wife can each submit one entry if each meet the eligibility requirements for the green card lottery program. You can either be in the U.S. or in another country, and the application can be submitted from the United States or from abroad.