Next Field (CHECKD) does not support Internet Explorer. This means that you cannot use Microsoft's old browser. The reason is that Microsoft stopped supporting Internet Explorer in 2014 and focus on Microsoft Edge (which we support).
We recommend using other browsers as Internet Explorer is neither optimized for security nor speed in today's network.
A list of browsers we support, with a link to install them can be found here:
Google Chrome (Recommended)
Microsoft Edge (OBS! only for Windows)
Safari (OBS! only for Mac)