As a participant in the “ARRL Logbook of the World” program (see http://www.arrl.org/quick-start), your own LoTW certificate must be imported into the operating system before it can be used to authenticate against this website. The import process is described here:
- Windows
- macOS
- Ubuntu
Then follow the link “Log in via certificate (ARRL Logbook of the World)” on the main page and select the certificate. The query looks different depending on the selected web browser:


