On the app: to see the student's attendance on Edvoice, you simply have to access to Edvoice app, click on the 3 lines situated on the upper left. Once pressed, select the option: Assistance.
You will see the list of the student's subjects with all the assistance information of the different subjects.
On the web: You only have to press the option that appears at the top: Assistance
Remember that if you have doubt, you can write to us at firstname.lastname@example.org