As I see, your course for Group 1-7 is in progress so, you must have to wait for it to be marked as Completed. After the due date, it will be automatically marked as Complated and when it is completed, there will be an option "Get Certificate". You have to just click on the the "Get Certificate" option and your E-Certificate will be downloaded in PDF format.
Here is a screenshot with steps to get your certificate
Regards, Muhammad Athar (BS.SE)