XSeries, professional program and MicroMasters™program certificates are automatically issued when you have received a certificate in each of the individual courses in the Series.
When your certificate is ready, a link will appear on the Program Details Page. To access this go to your edX dashboard, click the programs tab at the top, then click the particular program. A link to view the certificate will appear in the upper right.
For more information about certificates, see Receiving Your Certificate in the EdX Learner's Guide.