Northwestern affiliates can register an ORCID through this link: https://orcid.it.northwestern.edu/
Anyone can register for an ORCID directly through their website as well: https://orcid.org/register
Prior to registering, you may want to search the ORCID database to check if you already have an ORCID. If you've lost access to your ORCID submit a request to reclaim your account.