Whilst our service desk will always try to be helpful, they can only support the OpenAthens end. Information about Mandarin Library Automation was correct at the time of writing.
Access the administration area as the domain administrator and navigate to the redirect link generator (Resources > Redirector link generator).
The part you are interested in is the bit like this:
Even though the redirector is not a proxy server, we can use the proxy server function in MLA to insert the redirector prefix and achieve a similar goal.