You can add a link to text or an image which opens up to a pdf, word, excel or other document.  

To add a text link, highlight the text you would like linked, then click on the link button. Click the 'select/upload file' button and select the file from either your computer or your website files, then save changes.

To add a link to an image, click to edit the image, then ensure the 'link' option is selected. Click the 'select/upload file' button and select the file from either your computer or your website files, then save changes.