This article and video will show Notaries to fill out each part of a notarial certificate, and common mistakes to avoid. After the Affidavit of Service is done, it must be filed with the Court.Learn how to notarize a document in five simple steps. The National Notary Association has helped Notaries perform their duties for over sixty-five years. Everything you need to know about notarizing affidavits. Learn what an affidavit is and how to notarize it. Below is a selection of forms that you may print out, fill in, have notarized, and return to the Clerk of Courts office to speed up your transactions. I am over 18 years of age, competent to testify in all regards, and base my testimony on personal knowledge.