If a Document was created from a Template with Placeholders you'll find them in the Placeholders sidebar on the let side. Placeholders are a great way to streamline entering information into a document, as well as help validate if all critical items have been added.
Selecting a Placeholder
To select a Placeholder you can click a Placeholder from the left sidebar, or on the Placeholder in the document - both will open a small pop-up above the Placeholder in the document that will let you add a value to replace the Placeholder, or if the Placeholder is not needed you can also delete it.
Note: If Track Changes is enabled, replacing the Placeholder with a value will create a new suggestion.
Required Placeholders
When you have required Placeholders, Propdocs will automatically check to see if they've been completed before performing certain actions, such as sending a document for review, or sending for signing. When prompted you can click Review to continue reviewing required Placeholders, or "Continue Anyways" to perform the requested action as-is.