If you are creating documents on Google Drive and you need them to get signed, you can quickly send them directly from the word processor's window.
Once you have the add-on install, proceed to Google Docs and create the document as usual. When you're ready to send it go to
Add-ons -> Signaturit -> Send Document.
A bar will appear on the right side from where you'll be able to edit your content's email.
When you're ready click on Send Document to start the signing process.
Visit this page to get more information about Google Docs + Signaturit.