The service automatically chooses the way of signing that is most suitable for the device you are on when viewing the document you’re about to sign. The system can detect if you have a touch screen and if you have an e-ID installed on your device, for example.
To sign using another method than the one chosen by the system, you choose Signings options and help or the box in the middle (Other ways to sign) after clicking on the green button that says Sign now.
Here you can also read instructions about how to transfer a case from one device to another.
Please note that the different ways of signing that you can choose between are configured beforehand by the person sending the document.