To generate ID card, go to Certificate > Generate ID Card then select Class, Section and ID Card and then click on Search button. The list of Student will be shown in the below of the page.
Now select student for generate ID card and click on Generate button present at right side in the student list, at click of this button students ID card will be open.
Note: Do not print the ID card directly, here select the Destination (save as pdf) and save pdf file and then print ID card using this pdf file.