If you are using the "Document URL" from document description within ProQuest, you do not need to edit the link.
View the abstract and details for the title you want to share by clicking on the article or ebook's title.
Find the document description at the bottom of the screen.
Find the "Document URL" line.
Copy the link and paste it into your document.
The Document URL includes our proxy prefix, so you do not need to add it.