After using the link above to request a Covidence invitation, go to your email to accept your invitation:

After clicking on the link, you will come to the below page. DO NOT type in your email and IU password! Instead, go the bottom of the page, and click on the sign-up link.

Fill out the form below, using any password you'd prefer. After that, you should be able to login to your IU Covidence account!
