How to Sign Documents | Nitro Sign Signing documents with Nitro Sign takes a minute! See the following screenshot for an example of the signing process. How to Sign Documents | Nitro Sign Click the checkboxes that you want to have filled in automatically. Signing Options · You can customize your signed PDF documents. See your options below. · Click on 'Edit' in the top-right-hand corner of the Nitro Pro window on the screen. · Click on 'Select Signing Options' and select your PDF documents you want to sign. This will display all available options. · In the 'Signing Options' section that is displayed, you can change every option you want in the following steps. If you select to only include an electronic signature, and only if the document contains the signature: • Enter the electronic signature that you would like to see. You can enter both an electronic signature from the website and an electronic signature that you already saved to your USB memory device. Your Nitro Sign software will automatically use the signature for this signed document. · Make sure your Nitro Sign software is not installed on your computer. • Click on 'Save Changes'.