Copy the URL from the address bar in your browser.
Before pasting the URL into your Moodle form, add this prefix: https://go.openathens.net/redirector/tru.ca?url=
In this example, your share link will now look like this: https://go.openathens.net/redirector/tru.ca?url=https://www.oed.com/dictionary/deuteragonist_n
Copy the modified share link and paste it into Moodle.