We do not recommend that you use webmail interface, webmail.fineartstudioonline.com, on a mobile device. It is better to use the mail app that is built into the device.
If using an iPhone, see this FAQ:
Setup and Access FASO Mail on iPhone and iPad
Instructions are available on this page for all mobile setups:
Let's Get FASO Mail Set Up on Your Favorite Email Program or device.
If you are going to use the webmail interface on your mobile devices, (accessing webmail directly from browser window), we recommend that you use the mobile login screen:
Web Apps for Mobile