Briefly specify why the document contains two signatures. You can use the subsequent paragraphs to provide additional details about your ideas.You will list every person's name in the notarial certificate, for example, "…before me personally appeared John Doe and Susie Smith and Jane Simon…. Your signature should be in blue or black ink. Allow four vertical spaces for your signature. STEP 1: Identify who to address the letter to. For letters and informal communications, sign above then type your name underneath. Then you're ready to format all your signatures at the bottom of your letter. Your signature represents you in all your legal matters. There are two basic styles of letters: block form and indented form.