Uploading a PDF to your page is much the same as adding a link.
Click the yellow "Edit button" next to a subpage you would like to input info in.
Go to Page Content and highlight the section of your text that you want to link to your document. Then click on the "Insert/Edit Link" button that is highlighted in the photo below.
This is what you will see:
In the photo above you can copy and paste the URL of the PDF next to the "Url" box. You can also have the adjust the text to display (title) anything you would like.
You can also set the link to open up into another window next to "Open link in..."
Click Save once you are satisfied and the link will appear in your content on your website (make sure to refresh the page)
And you're done!