The CO3 wallet is best suited to be used from a mobile device.
From this page you can easily access the CO3 wallet using your mobile device

Point your device camera to the QR code below to open the CO3 Wallet application on your mobile phone and follow the instructions (You should be prompted to open a link)

Don't have a camera or the QR doesn't get recognized? No problem! Open a web browser on your mobile device and type the address stage.co3.apeunit.com