How will I get updates and instructions from you during the test? Vessel Health March 05, 2021 17:03 Updated Once you get your test cards in the mail, you download our app and follow the instructions in the app. Related articles How do I reset my Vessel app password? Is the app free to use? Do I need the app to see the results or are they readable on the test card? Can children use this test? Are there age limitations?