1. To fill in the data using the online forms
2. To create an XML document with the certificate data and upload it from the application.
Each of these approaches have been explained in separate articles.
Both these options can be accessed from your dashboards as well as from the certificate listing pages.
1 - From Dashboard - Launch new certificate form
2 - From Dashboard - Launch upload certificate XML page
3 - From Certificates Listing page - Launch new certificate form
4 - From Certificates Listing Page - Launch upload certificate XML page