Make sure your bookmark bar is showing by going into the Edge settings and turning the "Favorites Bar" on.
Add a favorite by clicking on the star in the URL (address) window.
Rename the bookmark to "UMS Libraries Proxy Bookmarklet" or a different identifying name if you like. Make sure the favorites bar is the "save in" location, then Add.
Right-click the the link above and copy link.
Right-click the new bookmark, and select Edit URL. Paste the code into the Address window to replace the original URL (address).
Then hit enter to save.
Return to main page to test your new bookmarklet out.