From the "My works" tab look at the right side of the work for which you want to get the registration certificate and click on "Registration certificate"
To obtain the Registration certificate of a work the registration must be firm.
The definitive registration implies that none of the relevant data might be changed, such as title, author and the work itself.
SAFE CREATIVE provides a period of 24 hours (pre-registration) throught the one the rights holder can perform all sorts of changes. After this period, the record is definitive and firm and can be the Registration certificate can be obtained.
Also from the "My works" tab and at the right of the a desired work, you might optionaly skip the "pre-registration" period by clicking on "Finalize preregistration" and so be able to get the registration certificate.