Click the icon of the square with the arrow going outwards of it (share icon) at the bottom center of the screen.
Click on Add to Home Screen.
Click on Add.
You can now access Vaigo through the home screen of your smartphone.
Hint: Make sure to copy the login code from the e-mail and paste it into the login form, instead of clicking the link. Otherwise you will be logged into the Vaigo website on your mobile browser, instead of the Vaigo webapp.
You will remain logged in on the platform as long as you open the webapp regularly.