Without knowing what app you are using, I can only guess, but if you can email the doc it will be from the word processing app. Look for the sharing icon (looks like a box with an arrow coming out of it). With your document open, or selected, choose this icon and it should give you an option to email it.
If it's the Pages app, it's the wrench icon when you have the document open. There is a Print and Share option that will let you email the document.