To generate certificate, go to Certificate > Generate Certificate then select Module, Patient Status and Certificate and then click on Search button. The list of patient will be shown in the below of the page.

Now select patient for generate certificate and click on Generate button present at right side in the patient list, at click of this button certificate will be generate.

Note - Do not print the certificate directly, here select the Destination (save as pdf) and save pdf file and then print certificate using this pdf file.