The phrase "to sign the certification" means to officially confirm or approve something by signing a document that states it has met certain requirements or standards.
Sentences with «to sign the certification»
(v) a dated and signed certification by the individual that the information provided is true and complete. (recbc.ca)
The designated individuals who are responsible for the two signed certification statements should also be reviewed. (fooddrink-magazine.com)
Sign the certification on the back of your renewal application. (www2.erie.gov)