Clicking on Manage Site Documents allows you to upload new documents, get links to uploaded documents, or delete uploaded documents from your site.
You can find Manage Site Documents under Site Tools, on the right side of your Toolbar.
When you click on Manage Site Documents, you'll first see an option for Uploading a New Document to your website. Click on Choose File, and then select the file you want to upload from your computer's files. After you've selected your file, click Upload New Document. (Note, that you may only upload documents smaller than 32M, and they must be either TXT or PDF format files).
Your uploaded documents will appear in a list under Uploaded Documents. You can choose to either View your document, Copy the URL of your document, or Delete your previously uploaded document from your website. If you want to add a link to your document, click on Add To Page, Link, and then Document Link.