You can sign for your co-founders - the person signing has to be a director of the company so it probably has to be a co-founder. If you have specific question

You can sign for your co-founders - the person signing has to be a director of the company so it probably has to be a co-founder. If you have specific questions about the H1 you should contact the Buxfer founders - they're the first YC company to successfully get them.