If you have an ORCID already and would like to be able to log in with your DuckID, you'll follow the same steps for creating your ORCID with an institutional login, with a small change:
Enter "University of Oregon" and you'll be taken to the University of Oregon's login page. Enter your DuckID and you'll be asked to link your University of Oregon account with your ORCID.
If you agree, in the future, you'll have the option to either use your ORCID or your DuckID to log in to your ORCID account.